We just released our latest tileset, another blocky, pixel art, 8-bit style perfect for platformers:
Rumblecade 8-Bit Factory Floor Tileset
The full tileset has a lot of options for variants built in, and even includes alternate palette versions. Also included are .tmx and .tsx files. We've tested it thoroughly in Tiled Map Editor and the terrain brush makes quick layouts a breeze. Then comes the fun part, adding all the little details and objects that can be used in many different ways. Enjoy!
PS, stylistically and layout compatible with out previous 8-Bit Platformer Tileset: Rumblecade 8-Bit Platformer Tileset