I'm almost positive that no old-fashioned lilacs (syringa vulgaris) have fall color (unless you count powdery mildew!) but I believe one or two of the new hybrids like 'Jose' or 'Palabin' just might -- have you tried a web search for "lilac fall color" or something similar?

Jim

My syringa patula ('Miss Kim') gets a burgundy cast. It's nothing brilliant, mind you, but I think it's pretty.