I'm gonna write this on my phone so if there is any stupid mistakes, you will know why.
First, get into your gimp or Photoshop.
Make your mask in only two colours.
For example, I'm (pretending) doing a red and blue one.
I want that desert texture. Not all sand, but not all pebbles.
Draw over the red with a green/blue and lower the opacity down. You will get a green/blue+red texture.
If you open up the mask in map maker and load "pebbletex" and "seasand" it will give you a nice, mixed look!
You can do this with any other terrain, but some of them (Like snowtex + bluecrystal) will make it very bright.
I hope you found this useful, thanks for reading!
