I'm a fan of using standing desks and wanted to figure out how to convert my home desk [which had 4x4" wooden legs] to a standing desk. I did so by: getting 4 12" 4x4s; nailing beam caps (http://www.strongtie.com/products/connectors/BC.asp) onto one end of the 4x4s; lifting the desk while my wife slipped the 12" 4x4s under the desk legs. $30 and 15 minutes work -> nice wooden desk -> standing desk.

* Note: I didn't attach the beam connectors to the desk legs since my desk is lodged in a corner and I didn't want to mess with the legs, but I'd recommend attaching them...