OldHat has posted a tutorial on Dust War about how to speed paint the crates and tank traps you get in the core sets and the expansion boxes. When he says “speed”, he means it!
So, this was just something I did because I happened to have my airbrush going for the day and wanted to tinker with the salt technique. Also, I didn’t want to labor over these pieces, as it was just something quick and easy to get paint on them.
Even if you don’t have an airbrush, it’s worth having a look at the tutorial as you might be able to replicate the general colour schemes with a brush.