Top 10 best CM7 Theme for you. Most of the latest Android HTC HD2 ROMs are based on CyanogenMod 7 (Android 2.3.3 Gingerbread). You can dress it up with Theme Chooser which is same as T-Mobile’s Theme Engine. Here are the top 10 CM7 Themes that I tried. Which one is the best CM7 Theme for you?