What Xbox 360 games allows you to unlock gamer pictures?

I know in Mass Effect you can download 2 gamer picture packs. And PGR4 unlock pictures when completing certain achievements. What other games can you get gamer pictures?|||I know I got some from the first dead rising and from Zuma. There may be more but I have loads of gamer pictures and can not recall which ones were unlocked, which were purchased and which were from demo discs. Wish I could be more help though. Oh! Wik unlocked some as well. I think bomberman act zero may have but I am not sure.|||I know that Call of Dyuty Black Ops does but im not sure try googleing it.