Melissa and Doug make wooden toys, including the kind of blocks you think you remember your parents playing with. They're smooth-sanded and plain, and they pack neatly into a little wooden crate for storage. (As if. These things are gonna be all over the floor, which is all the more reason to care what they look like.)
Melissa and Doug blocks are available at Creative Brains, a TX/MN toy store with a handful of online offshoots. [another thanks to Other Greg]