I have a bunch of PAX skin codes used on NA (some may be used on EU already, not sure), and I'm too lazy to do a contest, and I think selling them would be unfair, so I'm just going to give them away here:
Codes I'm Pretty Sure Aren't Used
PAX Sivir: KRJ64FCH4PTK, QQHC7UK6QAWA
K9 Nasus: 6DJWGMMNWFWM, GTPRRHVLXD63, N9HHNNHFMXMN, CX6K7GMK7U9F, DNLAAPQ967HQ, LHEHYMQTVTH6
Codes I'm Pretty Sure Are Used, But You Could Try Anyway
Nasus: KKJR4Y3LAHZ3, 2YJUKP6MENNG, VQ2URHWM77HG
Enjoy, EU West.