[Themer General Discussion] bsined:
After some painful times trying to figure out what key means what in the custom, scalable fonts provided by MyColorScreen, I realized I could extract the TTFs from the APK and create my own keymap. You can either download the PDFs to see just the characters or use the two lists below to find the icons you're looking for by description.

Do note that there're a few "missing" and cut-off punctuation characters (they actually display correctly in the widget). I left them as is to show how much the descender is lower than in Arial for reference.

You can also install Kii keyboard, which supports custom fonts, but I find it a bit cumbersome to use (switching fonts).

I hope MyColorScreen isn't upset with me taking the liberty to snoop around the APK.

Themer Icons description

A - person / contact

B - person / contact with plus sign (add)

C - share icon

D - dollar sign

E - credit cards

F - American football

G - normal football

H - book with a bookmark

I - phone headset with sound (ringing)

J - phone headset

K - a picture in a frame

L - camera

M - headphones 1 / cans

N - headphones 2

O - four squares

P - three bars of different width / sort icon

Q - message icon with the tail on the right

R - message icon with the tail on the bottom

S - back icon

T - bookmark

U - three dots arranged vertically

V - three squares arranged vertically (Android 4.0+ menu key)

W - Android settings icon

X - notifications pull-down icon

Y - pen / pencil / edit icon

Z - paintbrush

a - clock face showing 12:15

b - sneaker / sports shoe / tennis shoe

c - dumbbell

d - gamepad / game controller white

e - gamepad / game controller solid

f - cog wheel with a white ring

g - solid cog wheel

h - paper with torn top edge / newspaper

i - folded news paper

j - outlined white envelope

k - solid envelope

l - calendar with marked days

m - tear out calendar page

n - cloud

o - sun during eclipse / full brightness icon

p - half brightness icon

q - crescent / half moon

r - location pin with a GPS marker inside

s - solid location pin

t - round globe

u - world map square

v - film clapperboard closed

w - film clapperboard open

x - bag / cart

y - shopping basket

z - 3 person icons (one in front, two behind)

` - left arrow with a stick

1 - airplane flying around the globe

2 - Android airplane mode icon

3 - text / page / sheet of paper icon

4 - tag icon

5 - open folder icon

6 - heart

7 - microphone

8 - phone / device icon

9 - Themer logo

0 - outlined / wire 5-point star

- - dash

= - equals sign

[ - left bracket

] - right bracket

; - semi-colon

' - apostrophe

, - comma

. - period

/ - slash

~ - tilde

! - filled 5-point star

@ - magnifying glass / loupe / search icon

# - delete / backspace icon

$ - check mark

% - pointer up (no stick)

^ - pointer down (no stick)

& - refresh icon (two arrows in a circle)

* - pointer left (no stick)

( - pointer right (no stick)

) - right arrow with a stick

_ - underscore

+ - plus sign

{ - left brace / curly bracket

} - right brace / curly bracket

: - colon

" - quotation mark

< - less than sign

> - greater than sign

? - question mark

Themer Media Icons description

A - rewind icon in a solid circle (two less than signs sequential)

B - forward icon in a solid circle (two greater than signs sequential)

C - rewind icon in a solid circle (two less than signs overlapping)

D - forward icon in a solid circle (two greater than signs overlapping)

E - rewind icon in a solid circle (two wire triangles sequential)

F - forward icon in a solid circle (two wire triangles sequential)

G - rewind icon in a solid circle (two wire triangles merged)

H - forward icon in a solid circle (two wire triangles merged)

I - rewind icon in a solid circle (two wire triangles overlapping)

J - forward icon in a solid circle (two wire triangles overlapping)

K - rewind icon in a solid circle (two wire less than signs sequential)

L - forward icon in a solid circle (two wire greater than signs sequential)

M - rewind icon in a solid circle (two wire less than signs overlapping)

N - forward icon in a solid circle (two wire greater than signs overlapping)

O - pause icon

P - play icon (solid triangle)

Q - wire pause icon

R - play icon (wire triangle)

S - pause icon in a solid circle

T - play icon in a solid circle

U - wire pause icon in a solid triangle

V - play icon (wire triangle) in a solid circle

W - pause icon in a solid circle

X - play icon in a solid circle

Y - wire pause icon in a solid triangle

Z - play icon (wire triangle) in a solid circle

a - rewind icon (two solid triangles sequential)

b - forward icon (two solid triangles sequential)

c - rewind icon (two solid triangles overlapping)

d - forward icon (two solid triangles overlapping)

e - forward icon (two solid triangles overlapping)

f - forward icon (two solid triangles sequential)

g - rewind icon (two less than signs sequential)

h - forward icon (two greater than signs sequential)

i - rewind icon (two less than signs overlapping)

j - forward icon (two greater than signs overlapping)

k - rewind icon (two wire triangles sequential)

l - forward icon (two wire triangles sequential)

m - rewind icon (two wire triangles merged)

n - forward icon (two wire triangles merged)

o - rewind icon (two wire triangles overlapping)

p - forward icon (two wire triangles overlapping)

q - rewind icon (two wire less than signs sequential)

r - forward icon (two wire greater than signs sequential)

s - rewind icon (two wire less than signs overlapping)

t - forward icon (two wire greater than signs overlapping)

u - rewind icon (two solid triangles sequential)

v - forward icon (two solid triangles sequential)

w - rewind icon (two solid triangles merged)

x - forward icon (two solid triangles merged)

y - rewind icon (two solid triangles overlapping)

z - forward icon (two solid triangles overlapping)

` - left arrow with a stick

1 - solid circle

2 - Android settings icon

3 - three dots arranged vertically

4 - three squares arranged vertically (Android 4.0+ menu key)

5 - text / page / sheet of paper icon

6 - open folder icon

7 - headphones 1 / cans

8 - headphones 2

9 - three bars of different width / sort icon

0 - outlined / wire 5-point star

- - dash

= - equals sign

[ - left bracket

] - right bracket

; - semi-colon

' - apostrophe

, - comma

. - period

/ - slash

~ - tilde

! - filled 5-point star

@ - magnifying glass / loupe / search icon

# - delete / backspace icon

$ - check mark

% - pointer up (no stick)

^ - pointer down (no stick)

& - refresh icon (two arrows in a circle)

* - pointer left (no stick)

( - pointer right (no stick)

) - right arrow with a stick

_ - underscore

+ - plus sign

{ - left brace / curly bracket

} - right brace / curly bracket

: - colon

" - quotation mark

< - less than sign

> - greater than sign

? - question mark