[Galaxy A3, A5, A7, A8, A9 Themes and Apps] sertacdncl:
Before we start you need to TWRP for flashing and changing system apps.

Screenshoots

Now we can start it :D

Note! : If any app will stopped working , you have to delete apps cache in settings/application manager .

BUGS : 1- SystemUI sometimes stopped working but not always and not effective for using.(Its about notifications.When i get notifications , ui is sometimes stopped.)

1. SystemUI like S7 Nougat Updated Volume Panel Icon Fix (25/07/2017)

Just flash it and clean dalvik art cache / cache and when phone is active go application manager and find systemui and clean cache again.

Thanks for the fix @corsicanu

https://drive.google.com/open?id=0BywWn4RFYkAmLU1ZaUFmaFlOMEk

Lockscreen Apps Shortcuts Fix

2. TouchwizHome like S8

Just flash it and clean dalvik art cache / cache and when phone is active go application manager and find systemui and clean cache again.

https://drive.google.com/file/d/0Bx...are_link&resourcekey=0--9JJhEaXANG11PEKLhZvtA

3. Settings

Just flash it and clean dalvik art cache / cache.

https://drive.google.com/open?id=0Bx67seeCbtS0TnZCNmtTN0lOaWc

4. S8 Audios (Notifications,ringtones, ui sounds etc.)

Just flash it and clean dalvik art cache / cache.

https://drive.google.com/open?id=0Bx67seeCbtS0QmU4MEtJbzEwMXc

5. Contacts / Phone and Coming Call Screen

Just flash it and clean dalvik art cache / cache.

https://drive.google.com/open?id=0Bx67seeCbtS0SE5Ma1dzdEllNTg

6. Video Player

You need to change videoplayer apk with this.First open twrp and mount system.Go file manager and go system/priv-app/ find video player folder and change it.

https://drive.google.com/file/d/0Bx...=sharing&resourcekey=0--KfdbfvybZGTzS4gbhCyTA

7. S8 Weather Widget

Just flash it and clean dalvik art cache / cache.

https://drive.google.com/file/d/0Bx...=sharing&resourcekey=0-_7_NoXE5Deg5TNTs7DNCSg

Gallery, MyFiles, VoiceNote, WallpaperPicker, Clock(When you click World Clock its crashing but alarm etc. is working stable), Email, Memo

https://drive.google.com/open?id=0Bx67seeCbtS0WFhvbXN2aE5kM2s

UPDATE 1

8. Contacts / Phone Updated

You need to change SecContacs_M apk with SamsungContacs_Beta apk.First open twrp and mount system.Go file manager and go system/priv-app/ find SecContacs_M and SecContactsProvider folder and change it with this apps.

https://mega.nz/#!3gA0Db5B!ERWNRDJYBpoiY56Fx4tCT1PJ1Z6qRmpD_jGZM6UIMWM

9. S8 Fonts (If you want to do your lockscreen better you have to install it)

Just flash it and clean dalvik art cache / cache.

https://drive.google.com/file/d/0Bx...=sharing&resourcekey=0-RdoNi10uaaAtkeKxwOSEoA

10. S8 Calculator

You need to change calculator apk with this.First open twrp and mount system.Go file manager and go system/priv-app/ find SecCalculator folder and change it.

https://xdaforums.com/showpost.php?p=72075056&postcount=464

11. S8 Video Library

You need to change apk with this.First open twrp and mount system.Go file manager and go system/priv-app/ find SecVideo folder and change it.

https://mega.nz/#!ExplzByY!IHcQl8VYOgperlM3rW0AnUFz3FUAQldkifEQeD-gYTQ

12. Gallery

Just install like normal apk.

http://www.apkmirror.com/apk/samsun...-release/gallery-3-1-72-android-apk-download/

UPDATE 2

Stock Galaxy A7 Apps

https://drive.google.com/open?id=1arbL6xsT0Nor53PGuKn4k_HYNIi-a9ze

If i found new apps like this i will update this post always!

Thanks for reading.This my first post.Sorry for any mistake.