You can now make your own custom 3M skin for the Apple Magic Trackpad using GelaSkins' DIY process, which enables you to use your own photos and images. GelaSkins uses high quality 3M materials which are very easy to apply without any air bubbles and they leave no residue. You can also choose from many of GelaSkins' artwork from artists. This is a great way to customize your Magic Trackpad without spending too much. The DIY custom skins will cost you $15, and so will the stock artwork. GelaSkins does not have any info on whether their skins are fully compatible with the touch surface of the Magic Trackpad. 

Source GelaSkins