The SMW Cave Tileset recolored to SMB1. Comes in three designer colors;
(Credit to Chad for the background here)
(Credit to MarioWizzerd for the background here)
I made the Blue one as a request, and decided to go the extra mile and create a few extra ones, and put it all in a pack. Have fun, kids.
http://www.mediafire.com/download/zpjrj ... +Caves.zip