[RAZR i Themes and Apps] okaban:
So! After a couple of evenings of tests and fails I finally figured out how to change icons in status bar like battery, signal, alarm etc.

You will need:

Rooted(!) device

ADB (SDK)

Root Explorer or similar (like that for example http://xdaforums.com/showthread.php?t=1386362)

Busybox (Stephen's one from PlayStore)

7-zip

Phone USB Drivers

USB Debugging on

Windows PC

>>>MAKE YOUR SYSTEM BACKUP<<<, believe me, it will make your life easier if something goes wrong!!!!

1) Connect your phone and make sure you already installed all drivers (I took them from rooting steps http://xdaforums.com/showthread.php?t=1928509)

2) In your SDK folder find "platform-tools" folder, right-click on it with "Shift" button pressed.

3) From a drop-down menu click "Command promt"

4) In cmd type: adb devices <--If everything goes as intended, you will see "List of devices attached +

device"
5) Type: adb pull /system/app/SystemUI.apk (and leave cmd window opened for a while)
6) Open "platform-tools" folder and you will see SystemUI.apk (BACK IT UP on, say, Desktop)
7) Right-click on it----7-zip----Open Archive
8) Double-click on "res" folder and there same with "drawable-hdpi". You will see lots of .png files and it is good idea to copy them to a new folder "PNG" on the Desktop
Here are images which make up the status bar and its icons. Their names tell you little, but preview option will do the rest =) Most of them are .png images with 27*27 resolution, however Plane Mode icon for instance is 48*48 (maximum height of the satus bar!). All you need now is image redactor and imagination. If you lack it or are lazy like me, you can use someone's else icons - like icons in attachment here http://xdaforums.com/showthread.php?t=1218876
After choosing the icon, say Peter Griffins will be my alarm clock icon, find respective file name in our "PNG" folder. In our case it is "stat_sys_alarm.png", so just copy that name from the original file, give it to chosen .png file and drag it back directly to opened 7-Zip window and press OK.
After you are done with icons of your taste, choice or whatever, simply close 7-Zip window - all the changes we wanted are alreadymade to SystemUI.apk file. Now is the most challenging part - we need to puch SystemUI.apk back to the system folders.

9) On your phone start Root Explorer and mount root(/) directory and /system r/w. Go to /system/app, find SystemUI.apk, long press and tick all permissions.
10) Get back to your cmd.exe window. Type there:

adb shell (press Enter after each row)
pkill -TERM -f com.android.systemui - [I]we are terminating system process[/I]
exit
adb push SystemUI.apk /system/app/ - [I]we pushing the file back[/I]
adb shell
pkill -TERM -f com.android.systemui - don't ask why but tests revealed the second termination is a must =))
am startservice -n com.android.systemui/.SystemUIService - [I]we restarting system process [/I]

>>>At that stage you can see the status bar may disappear as well as on-screen navigation buttons<<< Do not start worrying yet =)))
imput the last commands:

su
reboot recovery

Your phone will reboot into recovery mode (CWM by turl1 in my case) and there you go to Advanced---Fix Permissions. Final reboot - here we go! =)))

Possible errors.

The worst you can experience is disappearance of status bar and on-screen navigation buttons. Where none-existance of status bar is more or lessmanagable, Back button is vital and the only way yo get it back is re-flashing or restoring to back-up.

While on cmd-exe you can get something like:
"not permitted" - refer to permissions of /system, /app or SystemUI.apk itself
"cannot find" - Busybox issue
"segmentation failed" - probably you went to low on level (root instead of shell)