I'm working on a Mars map of my own. Was actually making a custom theme for myself. I'll try yours though and see how it looks.
Which biome is it based on? I'm asking because a lot of the vanilla-themed Mars maps use boreal and just paint sand on the whole map:

Thank you for your answer!! I will try again this afternnon!

I'm glad you used a more rustic color instead of just making the grass blood red and calling it 'mars', good job!

Thanks for using my theme! Olympus Mons looks stunning! I'm always so happy to see people making use of my mod. I've put your map in the description too! I'll take it down if you wish though. Thanks again!

Hey there. Letting yiou know ive used your theme for my Real World-Olympus Mons Map located https://steamcommunity.com/sharedfiles/filedetails/?id=1563790760

this theme really is nice. kinda gave me some insperation cheack out my workshop if your interested in seeing what you inspired me to do if nt thats cool to I just wanted to say thanks for the effort you put in. :-)

Hmm, very strange indeed. Have you tried starting a new game with my Mars map and this theme enabled? does it appear green on that?

yeah, going that route. i mean I've played around with the editor, just never themes.
Tried re subcribing and following this advice, and can't seem to get it to show the red rocky terrain. The visibiliity and sun look alright, but everything is still grassy.

glad to hear you want to try your hand at map making with my theme! Just to check are you going to Tools at the main menu, map editor, new, user themes making sure the "Mars Theme" is centered/selected and pressing create? It should start you off in a map with that as the theme.

here's a link to the official wiki about map making as a helpful little guide to get you going too. http://www.skylineswiki.com/Map_Editor

If it still doesn't work, make sure you've tried re-subscribing to the if you haven't already. Hope that helps.

Alright so question then, if I wanted to make custom maps using this theme, how would I do that? I've subscribed to this and have made sure that it is enabled, as well as when I go to make the map, I select it from the user themes. Anything I'm doing wrong? Sorry, kind of new to the map editing.

Also, this is a map theme, not an actual map. If that's the issue you're having, then download this map, made specifically for this theme: http://steamcommunity.com/sharedfiles/filedetails/?id=629829195

could be that an update to the base game has caused this, I'll look into it ASAP. Meanwhile, try unsubscribing and subscribing to it again to see if it was a just a bad download.

So I can't seem to get this to work. The map appears green and nothing at all like Mars. Suggestions?

Thanks, I'm glad you like it!

This is awsome all the accuracies you put into it!

Cool!

Thanks, it's funny you should mention that as I came across that phenomena earlier today, mentally kicked myself for not checking and hoped no one would notice lol. I'll see what I can do about making it more accurate though.

Heres a fact you might find interesting to add to the theme (if you dont have it already)
Mars has blue sunsets!