HOW TO MAKE A TESSELLATION:
Gap Method Example 2
2. Fill the page with a pattern of them. They can be arranged in any repetitive symmetric way.
Now the difficult bit: look at one of the gaps between those images. Could you fill it with something that's just the right shape? In the example on this page, what might fit between the birds, without leaving any gaps nor making overlaps? An open book, maybe...or a different kind of bird... or...