Connect Social Networks: Earn 250-500 PTZ when you link your Facebook and Twitter accounts to your Lockerz account for the first time each.
Invite Friends: See this post for details -- Invitations
Someone Loves Your Decalz: Earn 10 PTZ every time someone loves one of your Decalz. Also, when someone loves your Decal, the member who originally grabbed that Decal off the web (or uploaded it) will earn 5 PTZ.
Upload Profile Photo (1 time): Earn 10 PTZ when you upload a profile photo.