Here's one that I know works on 4.01 M33 and I was told that it will work on 5.XX M33 also.
It's a ctf theme and not a flash0 like you asked for but it's really cool and has: a custom coldboot, a custom 4 second gameboot, custom fonts, custom click sounds.

It has a more "in game" style interface. All the icons and XMB elements were re-created from game screenshots from the PC version. Also added, are the custom click sounds taken directly from the game to add to the experience and feel of the xmb.

DOWNLOAD: http://www.megaupload.com/?d=PSN1ZWG6


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P.S. You don't need to donate to me for this! You don't have enough anyway! LOL