GifBook - Make animated GIFs into paper flip books
Miniature Mail - Little letters printed on demand and sent in tiny envelopes.
ASCII Prints - ASCII art on your wall ¯\_(ツ)_/¯
VSUAL - A new high-end print on demand marketplace for artists.
Printful for Messenger - Create and sell print-on-demand merchandise with Messenger
Gif Slice - Slice up gifs into art for your walls