I think the written tutorials Quenten was referring to are these two blogs?

EDIT: I can't believe they're 6 years old now.

Ah, a good choice. I used that one to do the Ferraris Style a few years ago. I've moved onto other apps these days, but I still use Krita from time to time to touch up seamless tiles that didn't quite go the way I wanted them to in other apps.

Looking good so far.

What software are you using?

It will be interesting to see where you go with this.

And yes - Jonathan Roberts provided the artwork for both these styles. His website is called Fantastic Maps if you are curious.

On the second question you can add a Color Key sheet effect to the sheet the grassland is on and cut holes in the grassland using polygons of the Knock Out Color (Default magenta) where you want the holes to be. Make sure this effect is top of the list, so move it above any Edge Fade, Inner you probably have on that sheet.