Wedgits

There's a "mystery box" at the beginning of every class that my toddler goes to on Fridays. It always contains a different cool building toy every week and one week it was filled with Wedgits. I hadn't seen them before and I had as much fun building with them as the kids. They seem deceptively simple at first, though the shapes - rhombus and octahedron - are fairly complex. But as you start nestiing the pieces and stacking towers, pyramids and other shapes, the possibilities of more complex building structures become apparent. I found them to be more satisfying than Legos and Megablocks, which we still love, but Wedgits offer a bit more flexibiltiy and creativity in the way you can nest and interlock the pieces.

FInd out more about Wedgits on their site (though it doesn't do the toy much justice).