I can come to the rescue guys.
I have 3d covers for all the system..
I forgot where these originally came from.. I think they are from GBA-temp but i am not sure i have to go through my bookmarks. i believe they may of been Wii covers.. Let me look and i update here in a bit..
Here is the links i have up on my emulator list @ psx. Sorry for linking to them (if outlinks aren't allowed? ) but i have them uploaded to their file hosting, Scroll down to bottom of Post #1http://psx-scene.com/forums/f190/emulator-list-102674/
Update found link was easier to find then i thought http://gbatemp.net/topic/324714-cover-collections-for-emulators-with-cover-support/
Yea these are for the Wii. but they will work on multiman. (try the bottom sets, on this link)