Hey just thought I'd share a few mods I've been running lately as got a bit bored with the standard stuff.. all for L4D2 unless otherwise stated and all are easily installable using vpks.. official servers don't allow custom content but most private (including the UDD server ;) will allow.. give em a go =)

Infected Skins
- Purple Witch http://www.gamebanana.com/skins/92637
- Lady GaGa Witch http://www.gamebanana.com/skins/87979
- Terminator Witch http://www.gamebanana.com/skins/86890

Survivor Skins
- Alyx (HL2) replacement for Rochelle (looks awesome) http://ofab.co.uk/rusty/download.php?view.400
- Ellis Bearded http://www.gamebanana.com/skins/101080
- Joker Nick http://www.gamebanana.com/skins/89150
- Ellis ACU Camo http://www.gamebanana.com/skins/84775
- New Orleans Police Coach http://www.gamebanana.com/skins/84679
- KFC Coach http://www.gamebanana.com/skins/81664
- Nick 'Scarface' suits http://www.gamebanana.com/skins/77954

Weap Skins
- M4A1 + Grenade Launcher http://www.gamebanana.com/skins/92065
- New AK-47 http://www.gamebanana.com/skins/88484
- Evil Dead Chainsaw http://www.gamebanana.com/skins/83108
- 2 Toned Chrome Autoshotty http://www.gamebanana.com/skins/90289
- Fanta Bile http://www.gamebanana.com/skins/78362

Sounds/Sounpacks (some vpk, some require you to replace the original sound so backup the original before trying them..)
- Anders, L4D2 Weapon Soundpack v.1 http://www.gamebanana.com/sounds/9661
- Spongebob Choccclate charger http://www.gamebanana.com/sounds/12331
- Spybreaks Melee Soundpack http://www.gamebanana.com/sounds/9979
- Requim for a Dream Tank (epic) http://www.gamebanana.com/sounds/11013
- Mario64 slide jockey theme (serious lolz) http://www.gamebanana.com/sounds/11563
- Mortal Kombat Tank http://www.gamebanana.com/sounds/11731
- Witch burning baby burn.. disco inferno (personal fav) http://www.youtube.com/watch?v=iJzfqrxtOiI (direct d/l http://www.megaupload.com/?d=8SBVHLHJ)