If you could help with the translations, it would be great!
What's new (changelog over the last public update):
-New UI (inspired by CyanogenOS theme picker)
-Android 5.1 support
-Auto-install themes after building (requires root though)
-Two-screens UI for increased simplicity and efficiency (main screen and editor screen)
-Get a preview for: wallpapers, lockscreen, bootanimations, fonts, etc...
-Auto generate colors from a wallpaper
Here are some screenshots: