I'm almost done building my main Chaos army, but I have a second hypothetical list I may do in the far future, as an excuse to empty out the Bitz box! This list is something of a "joke" list that I think still has potential. With three detachments, it's ITC-compliant and fully Battle-Forged.
++Helforged Warpack [Primary]++
Bonus Summary: Multiple uses ("Infinite Use" effectively) of Daemonforge, as long as the Warpsmith is alive. One Walker gains a 4+ Invul and becomes a Character.
Warpsmith - 110
Defiler - 195 [Warppack Alpha, Warlord]
Forgefiend - 175
Forgefiend - 175
Forgefiend - 175
Helbrute w/ Multimelta & Fist - 100
++Helcult++
Bonus Summary: The Cultists are Fearless, no matter what.
Helbrute w/ Multimelta & Fist - 100
35 Cultists - 150
35 Cultists - 150
++Forgehost++
Bonus Summary: Fancy rerolls to-hit/wound with the Soulgrinders
Soulgrinder of Slaanesh w/ Baleful Torrent - 170
Soulgrinder of Slaanesh w/ Baleful Torrent - 170
Soulgrinder of Nurgle w/ Phlegm Bombardment - 180
Total: 1850
This is a very basic list that does one thing: Saturate lots of armor, shoot you, and keeps moving forward. The Warpsmith hangs back to repair stuff and not die but is otherwise a tax. Forgefiends are to blow through vehicles early on, as well as to pop Void Shields. The Cultists mostly run around cover and string out for objectives, while buffering against Deepstriking Melta/DScythes/etc. The Slaaneshi Grinders are effectively pseudo-Maulerfiends due to Fleet and bonus Run.