I'm going for a modern, slightly mechanical theme - after all, my town represents an alien planet!
I made some custom paths that are primarily grey and blue, with some panels of night sky.
I've decided on a red, white, black, blue, and purple scheme for flowers, using only roses and pansies. Still don't know how long it'll take me to get blue roses, though. I hear they're nigh-impossible to breed.
I'm also going for modern PWPs - I particularly like the look of the tower, and some of the illuminated projects might fit. Can't decide between sustainable power or fossil fuels, so I'm not sure whether I'll be going Solar Panels or Drilling Rig. My bridges are in desperate need of replacement, as well!
It'll take a while, but hopefully I end up with something presentable to share.