For tiling the images a small section of the drawing is copied and flipped or rotated to produce a unit cell of one of the wallpaper groups, some examples are shown below. Click on a tile to go to a page that uses that tile as the background.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. The creator of the image is Matt McDonnell, please attribute accordingly (a link back to this website would also be nice). Tweet