Perhaps some splotches of color on the buildings themselves in select areas of the architecture instead of plain flat grey. "IN THE FUTURE THERE IS ONLY GREY..." is something I've been trying to get myself out of with my buildings to the point I rebooted my entire scenery collection last year.
Some worn dirty oranges on the vertical pipe's / struts / etc. I like to use a mottled turquoise like color on parts of structures as I feel it gives an interesting look to industrial sites. I use splotchy light blue paint that then has roughly and unevenly applied layers of green ink/wash applied. Sounds odd but the effect is gang busters.
Games Workshop, go sod yourself with a rusty chainsaw
- <3 your Specialist Games ex-customers
-[NetEA] Iron Hands
-Raptors Ambush List
-I HAVE NO POINT