Here's an idea for a Math in Art center: Tessellations.
I think it would be great to have them use the tessellation patterns like the ones you see in the photos the first week of the center. Then, the next week, have them create their own pattern for a tessellation. That way they get the idea of what a tessellation is first. Then, they have to extend that understanding into creating their own.
Hey! Wanna back it up for a minute. Here's an idea:
Week 2: Use the plastic tessellation patterns. These came from Sax. They still make them. You can still buy them!
Week 3: Create their own pattern for their own tessellation.
Scaffolding! There you go. Three weeks of Math in Art Centers! Feel free to ask questions and share your own ideas!