@Flavio Alves - To your first question: Yes, just save them onto a USB stick. I use a homebrew program called uLaunch.elf to transfer saves to and from my memory card. If you are unable to run .elf executables on your PS2, CD and DVD iso's of uLaunch are available at SKSapps.com under "PS2 apps -> Launchers".
I think there might be problems with naming the folder differently... I'm not sure, I've never tried it. You could try putting all the camos into one save file, but you'd do so at your own risk.
Years ago, I downloaded the 3 camos that were available in the US while the servers were still up, and each camo had it's own save file (Mummy, Grenade, and Santa). The rest I got from the link I shared with you. The camo saves aren't actually game-save files, just the camo data, so I think you need to give each camo it's own save file. I actually bought an extra 16MB "MAX" Memory Card for my PS2, incase I wanted to have all the Camo patterns on the same card.
That's all I know for sure.
You can try it anyway you like... My best advice is to make sure you keep backup copies of any files you change, before you change them. Best of luck!
