This is mainly a chart, but I will also give tips on how to calculate repeats, how much wool you need per colour and how to calculate shrinkage when felting.
I used the intarsia method for colour changes. If you’re not familiar with this method, you can easily find an instruction online.

Felting info
The rug I made with this pattern was seven rows, had ribbing of two stitches on each side and four rows of ribbing at the bottom and top. Before felting it measured 165cm by 115cm. After felting it was 110cm by 85cm.