I am currently remaking levels of older games such as Sonic the Hedgehog, Pac-Man, and Donkey Kong. Currently I have a Sonic the Hedgehog map based off a Japanese origami thing online. Its very small, for 1v1 only, and is almost done. The Donkey Kong level is the first level from the original game, in 2-D. at the top there are four grenades on two shelves to throw down at the people trying to come up! The Pac-Man level is going to be 3-D-ish but I have not started on it yet (trashed the earlier design because I made alleyways too small XD). I got a new PC so I will not continue to develop those maps until I my new PC is set up and ready to do whatever I want.
I might remake maps from newer games such as Metroid Prime Hunters, Pikmin, Mario Kart Wii (Balloon Battle levels), and maybe even numerous levels off of the Legend of Zelda games! I can already see a DM Hyrule Field level from the N64...