Hi Orzelek !

Just wanted to offer my potential contribution if you want. I've been creating various mod thumbnails that you can see here: https://mods.factorio.com/mod/MbrTestMod, so if you wish to replace the grey void, I'll be more than happy to create something with you !

Tbh I have no idea what could be on thumbnail for RSO. It's hard to put something there that will depict more sparse resources (esp after base game made that kind of slightly possilbe too).
It would be nice to have something - maybe stylized mod name at least. If you have some nice ideas please share.

Hi, I haven't forgotten you, I was just pretty busy on other mods, but I tried something, tell me if you like it.

It combines a factorio map with a topographical map.

Thanks - it looks nice.
I'm not sure if adding topographical map won't mislead people a bit - but it makes it look better then just plain factorio map.

I've added it to mod, thanks for picture :)