Here are some downloadable pattern schemes.
Tillions come in five types - middles, borders, corners, runners and finials. In these diagrams, each little square represents a tillion and you will see that they have bold lines on 1,2,3 or 4 sides. The bold lines represent the joining sides. The different colours represent different patterns, so if there are four yellow “middles” and eight blue “middles” in a diagram it just means that you will need four of one design and eight of another. All these patterns are symmetrical, but of course you can make anything you like.