The "grid" is actually a bevel added to the floor texture. After seeing it in action, I probably won't replicate that again. The true grid is a hidden layer in the XCF file at this point.

The water is a layer above the floor and I just couldn't find a satisfactory (to me) layer mode. I like the water as is, but I'll try the method you suggested.

The doors are the one thing I'd do differently. I was trying to find a method that works. Right now, the doors are made from filling a small pencil with texture and throwing a bevel on them. The only problem is that I wanted to make sure that they were straight, so I used a snap which places them under the walls. I am probably going to mess with that as well.

Thanks much for your input. After I play with the water a bit, I'll post another JPG file here for comparison.

-James