said by DarkLogix:
If you have a lvl80 or 85 with the shoulder enchant guys in Wrath open (forgot the name ATM) then get a lot of relics of ulduar and turn them in there.
I say 80-85 because I ddoubt the turn in would award a 90 any XP.
Sons of Hodir. Tried this last night, turned in 400 on a lvl 80 and got 0 guild XP. Think they may have hotfixed it.