We call that transparency acne.

Sometimes when the pixels in an overlying texture are the same color as the pixels in the underlying texture, and there is a glow, edge fade, inner, or bevel of either type on the overlying texture's sheet, the rendering engine gets confused and fails to recognize there's anything there on the overlying sheet. So it's read as a pinhole exactly one pixel in dimension. That's why the holes are all the same size.

I have noticed that this is quite frequent with when all the fills have coloring in the various terrain fills..

Place a new sheet with nothing on it between those two sheets which does sometimes work, or if it doesn't, copy the top polygons onto that new sheet along with the sheet effects. That can also sometimes work without further effort. If that doesn't work either, try changing the fills of the new copy polygons to Solid, and a color that isn't in either texture. If you have to go that far you may need to increase the width of the edge fade to make sure it doesn't show through.

@Royal Scribe My problem is that I have volunteered myself for too many real life commitments, and they are all needed and worthy of my time. I fit making symbol art and maps into my down time, so I apologize for how long this is taking. Rest assured that even when I'm not actively posting here, that I am still plugging away at this.

@Quenten Yes, I plan to make the beds and curtains separate with both having vari-color options. This way I'll be able to make just a few different designs for for the curtains rather than multiple versions of each bed.

A few curtain ideas I'm currently playing with. These are just the rough design ideas that I'm working on currently.

I work on this project as my life and time allow. Here is my latest success...

Scott is right, but love ya Quenten!

Thanks Sue! I must have made 100 variations and finally manage to get one that looks right. Yay!