On Nexus S MIUI ROM 2.5.25 :
1. Q: Background color, from Setting - Language & Input - under "Keyborad & Input Methods" - Android Keyboard (tap right icon) - menu show on the dark background color, just wondering since all menu has white background color in original theme.
2. Q: Setting - Sound Settings ; under "Ringtone & Notifications" : the chosen sound files show with extention (ogg files).
It's different with previous MIUI ROM 2.5.18, the chosen sound show only the name as sound title without extention files.