Clan Rewards

I got this off of Elite and it shows what you can expect from helping your clan level

Clan Level	Reward
1	Clan Background Pack 1 - Leaderboard - Clan Challenges - Clan Operations - Roster - Feed
3	Clan Background Pack 2
5	Clan MW3 Title 1 - Clan Emblem Generator - Clan Motto On MW3 Title
7	Emblem Generator Pack 2
10	2 Hours of Double XP - Clan Background Pack 3 - Gold Clan Tag
12	Emblem Generator Pack 3
15	Clan MW3 Title 2 - Emblem Generator Pack 4
18	Clan Background Pack 4
20	4 Hours of Double XP Emblem Generator Pack 5
23	Clan Background Pack 5
25	Emblem Generator Pack 6
28	Clan Background Pack 6
30	Clan MW3 Title 3 - 6 Hours of Double XP - Emblem Generator Pack 7
33	Clan Background Pack 7
35	Emblem Generator Pack 8
38	Clan Background Pack 8
40	Clan MW3 Title 4 - 8 Hours of Double XP - Emblem Generator Pack 9
45	Clan Background Pack 9
48	Emblem Generator Pack 10
50	MW3 Prestige Token - Clan MW3 Title 5 - 24 Hours of Double XP - Clan Background Pack 10