Here's a windows 7 mock-up ad I made, thanks to buzzkill and his tutorial on how to make a software box.
Link: http://paintdotnet.forumer.com/viewtopic.php?f=15&t=3305&st=0&sk=t&sd=a
Everything, including the box art was made by me, with the exception of the background of the 'Buy Now' button!
Enjoy, and please post any feedback!