I chose to make a colour wheel. I had been wanting to make one anyway to use as a teaching tool, but didn't really want the traditional painted wheel or to buy one at an art store. So I decided to make one using coloured backgrounds and various stitch types. The thread colours I chose to use on each colour in the wheel has a specific purpose; e.g. to show complementary colours or secondary colours or analogous and so on.
Rather than 6-7 stitches, I used 12 different stitches (it will actually end up being 14 as I also plan to add neutrals of black and white, which means I have a bit of homework to do to complete the whole project).
The coloured bits shown here are not stitched onto the background. I added felt to the back of each piece, then covered a lightweight board with flannel. The felt stays on the flannel and I can move them around and use only a few or however many I need at a time to teach the colour wheel.