I do not know how to insert a link to Twitter so here is a photo takne from a posting by "usina dos Kits" which has some of the most effective ground work I have seen.
Peter - i suppose i should not be surprised that somebody produces this type of base, although 'i had not come across one before.
Jakko - depending on the ground being depicted it may be possible to replicate with oil paints and normal ground work techniques, although since I am not into aircraft it is not something I will try to do.
If you’re a good enough painter you can replicate anything that way — for us mere mortals, an image editor is probably quicker, simpler, and gives better results