I found this plugin very usefull for creating 3D images of boardgame boxes.
Althought I have no graphical skill at all, the final result is always great.
If you like, you can have a look at an italian forum where I have just uploaded a preview of a new box made with the help of Shape 3D plugin.
It's likely that you won't be able to understand the text, but the picture is woth a look.
http://forum.egcommunity.it/showthread.php?t=24208