We usually think of WW2 jeeps as olive drab vehicles and pretty much nothing else. But the US Army did camouflage some of their jeeps. The allies, such as the English, practiced this as well.
Camouflage patterns were used by relatively few US units. The English seemed to use a “Mickey Mouse” ear pattern
FM 5-21, Camouflage Painting of Vehicles and Equipment, October 7, 1942 provides us with a glimpse of the various patterns available for use depending on location and time of year. A variety of vehicles have drawings that illustrate the “correct” pattern to use but we are mainly interested in the WW2 jeep on www.42FordGPW.com . For more info see WW2 Jeep Camouflage.