I'm wondering if it's at all possible to use a Terrain mask pixeled in paint for your custom maps. My computer {Asus EEEpc} likely can't handle GIMP so I'd rather not download it, and paint can save in .png so I don't get why it wouldn't be able to be used.
Or if anyone has any suggestions of a smaller but similar program to gimp or photoshop, with whatever details it needs to be able to be used by FH, I'd be happy to take them as well.