For parents who are trying to avoid plastic toys like the plague (and probably with varying degrees of success, considering the ubiquitousness of plastic), there is a Japanese company that is making affordable LEGO-style blocks out of durable woods.
Coming in a sack of 50 pieces, Mokurukku's well-crafted wooden MokuLock blocks are made out of maple and birch. Each piece measures approximately 32 by 16 by 13 millimetres, and come in a variety of subtle but natural shades, and textures perfect for sensitive little fingers.
And fear not, if your kids won't part with their plastic LEGOs, according to State of Green these wooden beauties are compatible with their plastic cousins.
An interesting aside: LEGOs used to be made out of wood, before the factory burned down, twice -- prompting the move to plastic LEGOs.
The set costs US $32, for ages three and up. Check out Iichi to purchase.