I got one of the "Dreamy Blue" casings. These things suck so much. It's a waste of time, the right hinge cracked on me, similar to those with the left hinge crack, but it was on the right for me this time. I believe they also have a thread on their own forum with members also experiencing this. I got it because I had a left hinge crack. The thing feels super cheap, you can see indents on the surface where the opposite side would have plastic moldings. The cases are all clear cases that have just been painted, so when you hold it up to the light you can see through the case still. I just wasted time transferring my DS Lite into it, just to transfer it back into the original case which is way much better and solid. In my opinion, I'd just buy a new DS Lite, 40$ isn't worth it for that case.
PS: As for the chrome casings, you would think they're actual metal casing at least the outer surface of it, but from what I saw on their forum, it's just plastic that underwent some nickel plating process.
If you do get one of these, the hardest part is either pulling the antenna cable from under the Slot 1 housing, or reinserting the ribbon cable from the top screen to the DS's mobo. Overall, it isn't too hard.