Long ago (1994?), I used to play one of the ancestors to Dominions - Warlords II by Strategic Studies Group (australia). I modded some scenarios then too, and had hung on to my work and the other custom work by other modders.
Well, Warlords II is long dead, but I thought it would help other modders if I posted the graphics from those old game scenarios.
The first one is from a "star trek" mod I made. It might still be applicable to Doms3 with the right type of custom map... Have fun!