Marble runs have been a kid classic for years and it's no wonder-- they provide hours of whizzy fun, in addition to a shot of fine-motor practice and pre-engineering skills. This one's a real looker, but it's made of environmentally friendly rubberwood. The colorful set of curved rails and building blocks are painted with non-toxic German water-based paints, an eco-conscious alternative to the petroleum-based variety found in many other versions. A sustainable toy in more ways than one: the cool combination of funnels, tracks, drop zones, and blocks make for creative possibilities that will sustain children's interest for years to come. (Hape, $99.99).