Shades of gray Prismacolor markers, then colored in Photoshop. I didn’t have the colors I wanted, so came up with this method for getting that marker look with the colors I wanted. Kind of weird, but I love discovering a long, probably counter intuitive solution.
I was having such a good time making land look like it was underwater last week that I did it again. Although this effect looks more like it’s on watercolor paper, which is partly true. I actually used Prismacolor markers and messed with Levels in Photoshop. The photo, of course, is from Tucson. The robots are from my brain.