Gather some fabric and cut some strips of various widths (but nothing wider than about 3") and at least 14" long in warm colors and in cool colors. Remember from art class, warm colors are reds, oranges, and yellows. Cool colors are blues, greens and violets. Try to choose scraps/fabrics that have an obvious color feel to them.
Sew your warm strips together lengthwise and trim into 13" blocks. Do the same with the cool strips.
Cut both of your 13" blocks into four equal triangles.
Lay the blocks out as shown above (match a vertical warm to a horizontal cool, a vertical cool to a horizontal warm, etc.) and sew each set together to make four blocks.
This is what you'll end up with, four approximately 9" blocks. If you are in my bee group, please don't trim the blocks before you send them to me. If you aren't in my bee, by all means, make some more, trim them up and sew them together!