I Just made a PS3 Game Boot Logo (not a coldboot, it is a logo that shows up when booting homebrew or games from xmb) which I think a lot of people will find quite amusing. It has Peter Griffin farting fire and setting a ps3 on fire and in the fire it says "It Only Does Everything." and it's a mirrored image on both sides of the logo.
I used the compiler that came with XMBCustomize pkg to compile it.
I used 3 pics from 3 different sites which I modified each one for my game boot logo (removing backgrounds, resize, rescale, etc.). The sites I obtained the original pics from are:
These Sites are also included in the readme which is in the rar.
To install the game boot logo, just unpack the rar and drag the customize folder to root of dev_usb000 and then run xmbcustomize and hit x on Install it.
You can download the logo here: