Hazelnut Kids is one of my absolute favorite stores. In fact, I have come to know the owner quite well and adore chatting with her online any chance I get (even though she is a Michigan State fan).
This colorful set of wooden blocks in various shapes can be played with in countless ways. Stack them tall to look like a cathedral, create a whole neighborhood of colorful houses, or just stack different shapes on top of each other to see what unique shapes you can create.