FantasiFjas by Les Inkwell.
I stumbled upon FantasiFjas through a random G+ post and was glad I did. The tiles aren't "perfect" as in you can use them in a completely random fashion, but making them "perfect" would a) take a LOT more work, and b) take away a lot of the charm of these tiles.
You really should take a look at FantasiFjas and get some of these tiles for your own use. While I could go more into these tiles, the artist himself made a little comic about his work just for his increasingly English-reading fanbase. I've only borrowed two panels of the comic. so you might want to read the rest of it here (or click the panels below).