I have only completed 4 so far. The logo, controller pak, rumble pak, and the expansion pak. All icons are XP style, with sizes of 128x128, 64x64, 48x48, 32x32, 24x24, and 16x16. I'm not very happy with the expansion pak and plan to redo it in the future.
Icons I have yet to do are the controller, console, 64DD Disk, game cart, and a plane file with the n64 logo in the middle.
I'm also eventually going to release folders with some of these icons in them using foood's xp folder template.
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EDIT: Well I got bored so I finished the controller, the file with the logo in it, as well as a folder with the logo in it. I've also reduced the size of the icons to 48x48 since most people will ever need or use higher.