I know I am late to this party. However better late then never.
I use Rom Toolbox. I think this is a damn slick piece of software. You can tweak EVERYTHING.
Over/underclocking, Change icon on the top of the screen, change memory settings, change boot animation, change boot logo on select phones (I wish Marquee was one of those phones), block ads, Kernel tweaks, Build.prop editor, SDBoost (although I haven't noticed any increase in performance), change themes, icons, fonts and more.