mimiFoto is simple, yet brilliant. Do you tire of the stock iPhoto icon with that silly default picture? miniFoto lets you customize iPhoto's icon with any photo you like. And when you're sick of the TUAW logo peeking up from the Dock you simply 'Get Info' on iPhoto and cut the icon, which reveals the default icon that never went away.
Neato! Now, keep in mind this is a .1 release, so things might go a little wonky.