Back in the late 1970's, in pre-Photoshop days, an easy way to get unusual colors in your photos was to shoot with InfraRed film. Designed to be more sensitive to near infrared radiation (not the longer IR waves that we feel as heat), I shot these using red or yellow filters that reduced the colors in the blue end of the spectrum, to which the film is also sensitive.
These pictures were all shot in and around Ann Arbor, Michigan.