OK, here are three essential cover sites:

1. Falle's Place

http://www.thomas-anders.dk/fp/images/covers/swbox.jpg

http://www.thomas-anders.dk/fp/images/covers/sworiginal.jpg

http://www.thomas-anders.dk/fp/images/covers/sw95alvin.jpg

...and more.

2. DanB/Plamdi

http://plamdi.com/images/movies/set_singles_1.jpg

http://plamdi.com/images/movies/saga.jpg

http://plamdi.com/images/movies/set95.jpg

...and more.

3. Last, but by no means least: Grisan's Cover Collection

By Blaksvn (Rikter).

By Fatboy Roberts.

By ShuMai.

...and more.

And here are three more... essential covers from my rather extensive collection.

1. Darth Solo's Manga Covers

Covers: Star Wars, Empire and Jedi.

Disk labels: Star Wars, Empire and Jedi.

http://img503.imageshack.us/img503/6041/japset6rl.jpg

2. Fusionaddict

http://www.fusionaddict.net/gallery/sw_v_4/sw_v_4_set.jpg

Very nice!!!

3. PepsiOtaku's box art... I don't think anyone else has released a BOX design quite so inspired.

http://img238.imageshack.us/img238/522/swbox15ym.jpg

http://img238.imageshack.us/img238/6650/swbox29tl.jpg

http://img238.imageshack.us/img238/8662/swbox31kf.jpg

http://img46.imageshack.us/img46/1051/swbox40gl.jpg

They're each meant for 5 cases. I recommend using some kind of matboard for the material, or cardboard of the same thickness if you can find it. Enjoy!