Badges are made to commemorate legendary or epic threads, or just because someone is bored.
At this point there are, approximately, 20,000 badges, commemorating everything from the epic Wrestlemania 28 thread to that one time Barry Horowitz actually won a match. This page is an attempt to catalog them all.
Royal Rumble 2012 Too Many Limes badge
Wrestlemania 28 Legendary Thread badge
Wrestlemania 28 "End of an Error" badge
The NPO membership badge.
Raw 1000th Episode badge
WWE Week 2012 featuring the TLC ppv, Raw, Salute to the Troops and Smackdown
Hug It Out badge commerating the night Team Hell No got the entire crowd and most of the fWc to hug
Birth of the fWc Nexus badge
Cash in (to) Show the World badge marking Dolph Ziggler's successful Money in the Bank cash in
Punk beat Cena at MITB *blows kiss*
Ryder, Bryan, and Punk win
Summerslam 2013 aka "The Night Smarkdom Died"