Elaine Krajenke Ellison, a retired high school math teacher, makes these extraordinary quilts highlighting mathematical patterns. From her site:

I encourage the future teachers to try using quilts in their classroom. Quilts serve as a visual introduction to mathematical concepts that allows students to explore mathematics as they gain geometric insights. My quilts will engage the viewer in mathematical visualization, helping to further the role of problem solving.

Math quilts, via Evil Mad Scientist Laboratories.