Brown is oddly one of the least
steampunk colors there is. The Victorians invented FUCKOFF BRIGHT aniline dyes
and you'd better believe everybody who could was wearing them, often in combinations that would seem psychedelic to a 21st-century eye. Bright colors were new! and scientific! and as far as I'm concerned if you don't have something to break up those drab earth tones you're probably a peasant. I mean, sure, maybe you are
a peasant. But you don't have to be.
Neon was a much later invention and looks so 80s to me I'd have a hard time figuring out how to use it, but that doesn't have to be a problem for you either. I'd love to see somebody finally make it work for them.