Here are some Ceorls - or perhaps Geburs - trying out their new mode of travel.
Here's a couple more shots
This is what the basic tray looks like
This is after adding some sand, grits and rocks. Then painted to match the figure bases with added static grass, clump foliage and grass tufts, etc.
I'm very pleased with the results and will make several more (I have 4 trays in total). They were easy to order and very easy to sand/paint. Hope you found it useful / interesting.