This wooden eco-PC concept from Dell ought to be Dell's smallest PC. The computer is 81 % smaller than a regular desktop and needs 70 % less power. Dell does not reveal any details about the inside of the machine, but ist is said it will be launched later this year, and could cost between $500 and $700. More picures can be found here:
earth2tech.com

So far there is no wooden Gigaset scheduled but check out these Gigaset ECO design studies:
Gigaset Eco Visions - Solar
Gigaset Eco Visions - Leaf