How about velvet smooth wood blocks that last a lifetime? This is a pic of our living room floor, with an amazing set of blocks Ursula received from our friend who used to teach in nursery programs around the city. More pics and info below on blocks, wool pelts, rug, etc.....

Unit Blocks: Community Playthings
Dark Wool Pelt: Three Corner Field Farm
Hand Knotted Wool Rug: The Rug Company
Book Cases: From Sara Kate's father - barrister bookcases