Just the same answere as always:
Take a look into valve maps.
For example on well:
Red - bricks, bricks and ... bricks:
Blue - blue metal and light blue/white concrete
Or how about freight (also if it's not a valve map):
Red:
Blue (bad photo):
There are many more maps, like granary and stell (non-valve).
You can take a look at those your self, good luck.
Bloodhound