This "C" tile can cover infinite plane by itself, but if you want to create a finite shape with clean contour, the "J" tile will come in handy.
When i printed these tiles my daughter started playing with them and came up with some interesting color variations.
Take a look at the pictures. Where the shape is a square or rectangle with a clean contour, "J" tiles are included as well.
Also check out:
https://www.youtube.com/channel/UChKp-968z1i5PN29gbR7YfA
https://www.cgtrader.com/rorys3d
The author marked this model as their own original creation.