It's Presidents' Day, silly. And it's also a day for a Blankapalooza color prompt. Put the two together, and your next square should be
ANY COMBINATION THEREOF.
If you've been keeping up with each prompt, this should be your fifth square. If you'd like to show the other Blankateers some of your work, send a picture to me, and I'll share it.
And don't forget to knit something for Bridget's "Harry's Hundred." Plenty of helping others knitting to be done.