I use to do this on 1up, I would find a bunch of awesome Custom Covers and post them on my blog on there to share them. Thought I should bring it back after Lee was talking about generic cases.
Killzone 3
Alice: Madness Returns
Bioshock
Bioshock 2
BlazBlue
BlazBlue Continuum Shift
Darksiders
Dark Souls *couldnt get way with not posting some Dark Souls art*
Fallout 3
Fallout New Vegas
Metal Gear Solid 4
there is sooo much more then what I have posted and there's also another site called vgboxart.com. Now on vgboxart.co not all have a printble verison. Allthe onesI have posted should be printable.
Instruction on printing them are on this page as well as you can look at more covers. You wanna look through all the pages. Not all of the cover arts are on the main page linked. There is a lot there to look at.
One of the members on the site printed evereal of the covers out and posted how they look. I love this kind of stuff. The people that do this Im envious of, I tryed making a custom cover for the newest sly game but....well it didnt go so well :(. Anywho, hope yall enjoy!
Theres another site called Coverart.com that does covers for all systems and most games but I only use it for ps2 games the 360 is easier to find complete copys but anyway thanks for these custom covers very interesting.
I looked at the site and couldnt find covers,lol.You will have to help me on that one.
Sorry Nicole gave you the wrong info follow this link its a cool site.
Oh I know what site you speak of, Ive gone there here and there but they mostly have stuff that is the original cover for the game. Comes in handy for older games though!
Yes its just replacement inserts for the original covers which I like using for my ps2 and ps games that dont have the inserts.
Thats pretty cool, I did not know about these. 
I welcome you to your new addiction ^_^ Your welcome!
Very nice shares. I'm almost tempting to print any of those designs and put them in my boxes.
I plan to do it myself at some point. I love stuff like this!
I think the alternate cover for Bioshock would have been a good idea as it doesn't really give much of the actual story & mood away yet it still relates to Rapture in some way. People would be twice as surprised and terrified being thrust into a ruined Rapture with big daddies and splicers around every corner!
Thats excatly way I wish some of these cover arts were the ones that actually got used. This stuff would have been big eye candy for gamers.
Both that (great reason) and that the vanilla Bioshock cover spoils quite a few revelations right off the bat. Subtlety is better sometimes!