kindergarten color wheel umbrellas with fingerprint rain. Not sure what kind of colour wheel this is, but I like the concept. I find it helps for future concepts to always have the complementary colour directly across from it's mate.
Geometry Robots - students design it first, to become familiar with the different quadrilaterals. After, have each student study his/her own robot to explore the properties of different shapes. Can do a compare/contrast or Venn diagram: