The creative juices are flowing these days for some reason. Here is a Slaaneshi list I might build ... someday ... someday.
Sorceror
MoS, Familiar, Mount of Slaanesh, Personal Icon, Lash of Submission, Warptime
1x 12x Noise Marines
12x Sonic Blasters
2x 10x Chaos Marines
IoCG
2x Plasma
Rhino
2x
TL Bolter
3x 6x Lesser Demons
1x 6x Bikers
IoS
Power Weapon, 2x Flamers
3x 2x Obliterators
// 1847
I don't really know where to put the Sorceror, in with the Noise Marines is good enough. I think this is a competitive list. The Bikers and
CSM squads are Renegades under the leadership of the I5 Power Weapon champ. Toss in some help from the Obliterator cult and some demons and voila. Paint-worthy.
... I could also have the hot shot Power Weapon champ get ripped apart by a Greater Demon after swapping out an Obliterator. How will the story end? Only time will tell.