Hardwood desktop for a sit/stand desk frame. Made from walnut planks ranging in width from 3-6" and length of ~5ft bought via mail order. Hardest part was jointing the boards (making the edges flat/square) using a router instead of a jointer, which I don't have (yet). Probably too much waste material but you learn as you go.

The fun thing about wood projects is you can cover up mistakes pretty easily and for big mistakes just make the project smaller.