do it! you know you want to.
as tempting as the idea of an all chaos termie army is, sadly i've got about 5 other armies to finish first...
still though, a nurgle 'plaguewing' army would be sweet! you could use 2 small squads of plague marines for your troops choices, and then load up on termies, a dreadnought, oblits & perhaps a land raider?!
cheers!