I've always loved the over-saturated color of Kodachrome slides. I remember that my dad had some Kodachrome slides he took in the mid-'50s of my oldest sister when she was a toddler with a Mark Ryden-esque giant bunny doll, and the colors were just intense. Sort of hyper-real. Wish I still had those slides, but I'm guessing that they're with one of my sisters.
You can find tons of great images and artwork on the LOC website (where these photos are from). In fact, the cover art for Milk 1 was adapted from a section of a WPA public health poster on the site. Unfortunately, searching the site is not exactly intuitive, and you can spend hours searching for specific items only to hit dead-end after dead-end.