Cobweb Skin: https://www.facebook.com/xboxuk/app_2 - Enter the competition, you will get the skin after entering your name, email and gamertag. (Needs a Facebook account) Paintball Weapon Skin: - go through the quiz and click on all the info, you will get a code at the end.
Ehh ... Baird's weapon looks awsome , i think its like the peacekeeper with the Suppresor (Suppresor from Halo 4)