I didn’t really know how to word my subject, so sorry if it doesn’t make much sense.
Basically I am going to have a floor texture, but certain parts of this floor I want to color based on area. Each area might be any possible number of shapes. This data is something I will read in, so I will not know prior, which means it’s all variable.
For the walls I used custom meshes as found in the tutorial, but I used depth to allow creating of squares as shown in the tutorial. The only thing is when you fill the indexes they have to be triangulated. 
If we look at this picture you can see the top right(green) is an odd shape. Ignore the boxed objects.
Is there any way to just define each of the points given and then fill in the bounds of those points? I am not making a custom shape, I just want to get the points, and then color the texture I will have down based on those bounds.
Thanks