All BlackBerry Theme for 8520 aka BlackBerry Gemini

Please click link list bellow if you want tray good theme blackberry 8520

GingerBerry Themes 8520

Gingerberry Themes 8520
Neon Blackberry Theme 8520 
Teal Blackberry Theme 8520 
 theme Naruto
Windows 7 Blackberry Theme
Theme iPhoned85
CB_Blackberry Theme 
Theme blackbutterflies8520
theme Green lantern War of Light 8520 
   theme hitman

if you see link broken please report with comment.

Os 7 Theme for Kepler aka 9300 / 9330

How to Create Blackberry 7 theme Bold, Pearl, Davice, Dakota,etc with blackberry theme studio 6

Blackberry theme studio 6.0

Step 1

You need to make a theme that your device deems compatible. For this you need to trick your way past the theme builder. To achieve this, you need to navigate to c:\program files\research in motion\blackberry theme studio 6.0\resources\theme\blackberry6_480x360.

Here you find a few .properties files, grab the 9780blackberry6.properties file and copy it somewhere for safe keeping. Now you need to edit that file so its contents tell the theme studio to export for OS7. To do this you need to change a few lines of code in the file: line 10 is the theme.base which should = BlackBerry7_640x480_b and line 11 is theme.alternate which should = BlackBerry7_640x480_bs1. Next, alter line 25 to read 6.0,7.0 as the supported OS, line 26 to 7.0 as the default export option, then line 27 as 6.0,7.0 for the imported OS.