@ATLAS I realize now that the nonportalable tiles are a bit difficult to tell apart in the pictures I posted.

Here's a side-by-side with the beta textures on the left, and the custom textures on the right. Notice how the beta textures also include an extra large tile on the far left. I am leaning more towards the beta textures since they stand out more and show up better in areas with little light. Here's another comparison.
And here's what it looks like in a map. I'm probably keeping the custom portalable walls, as they fit in with the warm colors, and using a default black tile for the nonportalable floors, as the beta textures don't look that good as floors.

All discussions about design changes go here.
Here's the announcement

Thanks for helping out! After a tenth map is posted to the workshop, I'm going to stop posting there. I'll need some playtesters for the other maps, and I'd be glad to let you try them out! I'll let you know when some are available!