I only have two links, but they're pretty cool. At our last PD (the CS in Algebra on in Downey), the facilitator (I forget his name, but he's from Florida) suggested having students create international flags in the free play area. It was a great activity. Even though many of the students picked really easy flags, it was still valuable for them to think through the process.
I did, however, have a couple of students who took it to another level...
The Union Jack:
The US Flag!!!!
**Check out the code on this one... It's pretty incredible how much work this kid put into this! I was amazed!