I have come to realise with the news lately that (for us Americans, Europeans, and Aussies) Wii Sports come in a cardboard slip rather than a DVD Game Case. While I do not mind that, I have read some complaints on the issue, and I also too would have liked it seen in a DVD Game Case.
So, I have designed a Wii DVD Print-Out Cover! What you do is get a normal DVD Case (best is if its in white) with no image on it. Then you unfold the plastic slip, and after printing this out and trimming, slide the Print-Out behind the plastic slip. Now you can just put Wii Sports in this case and it will beld into your stack of Wii Game Cases.
http://webzoom.freewebs.com/tetromino/Wii%5FSports%5FSlipCover.PNG
Enjoy!