Once again I didn't manage much rainbow work:
As you can see at first I had the fabrics switched, but I'm sure they'll come in handy before the end of April.
I used this McCall's tutorial to make the flying geese.units. In this method the large square gives the four large triangles, and the four small squares give the eight small triangles.
So here the flying geese units need:
1 large square = light
4 small squares = dark
I'm sure lots of other people have done much more, so head over to Soscrappy to see what they've made.