Sprite Sheets
What's a sprite sheet, you may ask. Sprite sheets have all the animation frames for the characters in a game. The original creator for the site made these using the NESticle emulator and Paint Shop Pro. If these get a favorable response, more will come. You can just look at them, copy and paste to make your own scenes (which is what He intended), or edit them to make fake screenshots (can you say HIGH SCORE!!!!). Enjoy.
Sprite sheet birthday cards
Mario Bros.
Super Mario Bros. 3 (map assets)
Donkey Kong
Super Mario Bros. (Enemies)
Super Mario Bros. (Background)