A Light Blaster is a device that projects slides or transparencies onto walls and models. There is a commercial Light Blaster version for small strobes out there and it does have a studio adapter. But I, as always, prefer to go the DIY route :)
Though this article will have a lot of build info, the reason I made this is because I had a photo in mind and wanted to create it. Of course that once the tool is built, it pushes me to use it in creative ways.