Indented Squares Tetrominoes

A bunch of Tetromino (aka Tetris pieces) with indented squares in both 10mm and 15mm versions.

Print 2 full sets of 10mm in different colours and you'll have the perfect coffee table toy that would entertain you for hours!

Or maybe print a bunch of them to make pixel wall art? The possibilities are endless :).

FreeCAD 0.17 source file included if you are interested to know how I designed them.