Finding good fantasy mapping blogs is hard, I don't know too many, to anyone else interested in this Here Dragons Abound[0] is really good resource.
Any others people really like?
Now, as a metaphorical example, this has much wider application.
- What sound texture can I add to my ambient tracks?
- What flavor texture can I add to my cock-a-leekie?
- What philosophical texture can I add to my pitch deck?
Interestingly, I think I recognize the background tile on the page as a member (or slight modification of a member) of my favorite wallpaper package propaganda-debian. In any case, author is clearly a connoisseur of textures.
Nothing to do with cartography specifically, just "parchment" effect.
That's a lot of words for an entry level Photoshop tutorial.
My favorite example of food texture is the fried chicken explosion: https://i.imgur.com/UhAODHB.gif