Know any programs make maps that look like this?

An appeal to all my friends out there who do a lot of mapping. I'm looking for something very specific, and was hoping that someone out there might know of a cartography program that can make forest terrain that looks like this:

That's a scan of one of the old SPI wargames from the 70's, and I'm pretty sure they used the old Letraset rub-on transfers for their terrain, back in the days before computers, and this was a standard pattern used in cartography and architecture.

Anyone know of a modern program that will create the same sort of effect?