I have weekly engineering challenges. Rigamajig has added a completely new dimension to them. During literacy time the students use Rigamajig to build scenes from a story or construct ways to solve the character's problems. At the writing station students then write about their creations and how they solved the problems. In math the students have used them for anything from practicing tally marks, powers of 10, and making patterns and shapes to composing, decomposing, and ordering numbers.
I feel confident Rigamajg could be used to reinforce any skill in the classroom! Not only does it help us with engineering, but it also reinforces inquiry-based learning. The possibilities are truly endless!