I finished up the seagreen blocks and three of the red blocks (the final two are just placed but not stitched.) I don't know what I will do for multicoloured, perhaps some stripes where each block will end up being quite different. I can't use anything with a black background or the illusion of tumbling blocks won't work.
Here's the first multicoloured scrap I selected. The fabric was used for borders in a child's quilt and there was a small section left over. Don't you just love these wild kitties?
These will definitely add a fun punch to the H-blocks. Take a look.