I considered making a chaos list using a mixture of chaos dwarfs and beastmen from Eureka with a few copplestone bits for good measure
Chaos Warriors - Eureka
Chaos Dwarves or
Ogre BeastsChaos Marauders - Eureka
Beastmen (note there are 4 variants available)
Ogres - Eureka
MinotaursTrolls - Copplestone
TM4 Battle TrollsMarauder Horsemen - Eureka
DemonaursChaos Knights - Eureka
DwargonsChaos Hounds - Copplestone
TM8 Giant WolvesChaos Chariots - Eureka
Mammupach (note may be too big, it looks HUGE!)
Harpies - Eureka
EaglesDragon Ogres - Eureka
Wood Trolls (depends how strongly you feel treemen belong to wood elves!) alternately
FM5 Snow trolls might do the trick, slightly bigger than the 10mm scale trolls, could easily fit one-two per base
Chaos Spawn - Convert from literally any 10mm model
General - Various Eureka chaos warrior/beastmen or copplestone evil character models
Hero - Various Eureka chaos warrior/beastmen or copplestone evil character models
Sorcerer - The "totally not Saruman" model from copplestone TM10 pack would make a good sorcerer model
Chaos Dragon - Eureka
Gorgon Riders