Combining multiple dimensions of wealth, demographics, and occupancy in a similar image using color, borders, and secondary borders. I could (and will) add more with overlay patterns or patterns within the colors, etc. Since maps like these aren't for publication, they can get real ugly and confusing in the name of information density, and they turn a lot of vague heat-maps and broad design choices into a quilt of useful specifics I can treat as fresh clay.
