Source Code
IconFamily
a Cocoa/Objective-C wrapper for Mac OS X’s “IconFamily” data type
makes it easy for Cocoa apps to create and set custom file icons
Toys
Tiny Java Logo
the “Logo” programming language in a Java applet
(an ancient bit of dabbling that I can't quite bear to take offline)
Icon Sets
NeXT Slab Icons
NeXT nostalgia for your Mac desktop