The DSi's camera is OK for quick snaps but, like the early days of mobile phone cameras, it's quite limited in what it can do. Which leaves a gap in the market for clip-on accessories like Thrustmaster's Studio Kit.
It includes a range of add-ons to help bring the camera up to speed, like a macro lens, telephoto lens, wide-angle lens and even six colour filters.
It won't actually wring studio results out of such a tiny camera, obviously, but for only $20, it won't hurt, either. Well, except for that bag. That hurts.