Building Blocks Anyone Have A Good Set Of Plans For Making A Nice Set Of Children's' Building Blocks?

Anyone have a good set of plans for making a nice set of children's' building blocks? - building blocks

At Christmas, I wanted to make my son a series of modules for ever in his honor. I'm beginnin a carpenter for intermediate site and would be consultancy, plans to follow the easy to build a variety of Peices want. Please help!