I used http://www.thingiverse.com/thing:191709 for Piggy's hair.
http://www.thingiverse.com/thing:1037532/#files for Beaker's head and edited http://www.thingiverse.com/thing:242874 in Tinkercad for his hair.
Fozzy is wearing this hat http://www.thingiverse.com/thing:164761/#made
The rest was made on Tinkercad from scratch.
animal_chess_piece_1.stl | 1.0MB | |
beaker_chess_piece_1.stl | 5.0MB | |
fozzy_bear_chess_piece_2.stl | 367.2KB | |
gonzo_chess_piece.stl | 427.7KB | |
kermit_chess_piece_1.stl | 226.5KB | |
miss_piggy_chess_piece_2.stl | 676.7KB | |
muppet_chess.stl | 17.3MB |