I spent some time this morning playing with the land use image from 1975 in photoshop. Here is the original photo and here are some of my favorite results:
The yellow in this photograph shows the urban area in Maricopa County in 1975. The green is agricultural and the pink is recreation. I cropped the picture to select the southeastern portion of the county to include South Mountain, the urban areas of Tempe and Mesa and the agricultural areas that I remember from that time. Then I started modifying the image in Photoshop resulting in the three versions below. I used the color scheme form the photo without modification. I could make it bluer to match the color scheme in the challenge.