I thought this texture wasn't that great, its very cartoonish. Until I tried to find a better asset... yikes.

Its really hard to find top-down art vaguely resembling Rimworld's art style. If I do find something better I'll upload a link here so people can replace theirs if they want.

Edit: I am a genius https://i.imgur.com/pnAKm85.jpg

Replace your png at C:\Program Files (x86)\Steam\steamapps\workshop\content\294100\1545681321\Textures

with this: https://i.imgur.com/WIGRKYY.png