I like a bit of M.C. Escher art, and I was looking for some Escher images when I stumbled across this old blog post by someone who designed and made his own Escher-inspired floor tiles. Fascinating stuff!

Here's the main page, showing a photo of the finished floor: https://danceswithferrets.org/geekblog/?page_id=911

Then there's 8 blog entries, showing the steps he went through from initial idea to finished product.

As a bonus, here's a simple guide I found, which explains how Escher designed & made his tiles: http://static1.squarespace.com/static/5754f47fcf80a16bffa02c45/t/57c6b680f7e0abc8f6ac6993/1472640669212/Escher-tiling-instructions.pdf

It's so simple when you know how! But there's obviously still some artistry involved in deciding what shapes to cut & paste.