I did a search and didn't see anyone talking yet about this case by mad catz. It is called the 'NDS Lite Custom Show Case'. These clear cases come bundled with either NFL skins, or generic skins, here is their product info:
more info
more info
In any event, you can actually print out your own custom skins to go between the clear case and the DS. You can find the software mad catz provides here:
http://customization.madcatz.com/nds.html
Their software only exports to 72 DPI bmp (which won't give you much detail at all), so I made a Photoshop template at 600 DPI which you can find here:
http://www.dzgraphics.com/downloads/dslite..._template_2.zip
I printed out my skins on glossy photo paper and just cut them with scissors. Here are a few images of the skin i'm using now (art from deviantart.com):
The images aren't the best quality, but they get the point across (if you want better let me know or check out the link below). Basically if you don't mind the DS being a tad bigger (but still fits in my yoshi DS pouch) then this might be worth checking out. For such a small increase in bulk the DS does feel a lot more bulky, my guess is the weight of the case that makes it feel that way. With that said I do feel this clear case will definitely prevent gouging/scratching, perhaps even make it kid-proof. For $15 bucks it was a good solution for me and my plain jane white DS lite.
Big thanks to KirbyCube who posted this blog entry where I heard about doing custom skins with this case, you can find more info and pics there:
http://blogs.ign.com/KirbyCube/2006/07/31/26787/