I know that I can swap between nandroid backups from cm7 to MIUI and vice versa, but can I do it on any Froyo based rom? like apex for example.
Should be fine, as long as you don't mind a longer than usual boot time. I can switch between cyanogen and fenom via backups without a problem. I think problems occur if you're on a rom with a gb kernel though.
Go dance with the angels.
3G Icon Fix for Droid 2 Global+CRT-Screen-Off Animation(4.5.60x).
ICS Blur Theme for Theme Chooser