Hmm...I'm not sure if I could get an awesome matchy brown. At the distance of the caps, it's hard to tell, but there is some texture among all the patterns, and I don't think the browns are necessarily the same. I used more than one set of paper scans to do the wallpapers. I obviously chose ones that made sense in a set, though, since it was a gift and I wanted it to make sense.
Since they are trimless, though, I bet they would go well along with a few of the walls from Hysterical Paroxysm's megaset of painted walls.
Well, that's fine then.
I'll look round in HP's set to see some browns that will compliment that. It wouldn't need to be exact since there'd be the patterns. They are lovely though.