Mac and Hackintosh Help
PCE.js with System 6 and MacPaint
Unfortunately, I have been unable to find a good quality, functional System 7 disk image. I'm looking into finding or creating one, however, and will update this if and when I do.
Dark Lines icon set for Mac OS X
Download the icons here: darklines.zip (1.6 MB)
I wouldn't try to use these with Yosemite (or anything past Yosemite), and the small versions are merely scaled down large versions of the icons. That said, they worked very well on Mavericks when I tested them.