...Depends on the territory you choose.

(this should have existed in the beginning for some realism and the enjoyment of everyone)
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edit:
I'm suggesting this as free for all~ The GB feature could be making the territory BG Dynamic!

But Lioden team would be the ones to decide if its oasis only. If its oasis then I sure hope its dynamic, because the default BG is dynamic (day/night).
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Other suggestions:
by Lynnx (#3910)
"To make it easier on the artists there could be small changes made to the existing default BG. The middle ground of the BG where the trees are could be edited to be a water hole, desert, etc. and leave the rest of the BG as is. It would stay dynamic and largely unchanged except for the middle/back portion of the scene.

Tho it might be a better idea to just update it and do all new BGs as suggested, since the art is so old.

They could also recolor the Monkey Business BGs to be monochromatic like the default BG, that would be minimal work for the artists and would still give people a reason to buy BGs from the monkey."