Start by opening some images you want to convert into same color tone. We want to change color tone of images based on the color tone of car image.
Click to enlarge Select the image you want to change color tone. We've selected the first one.

Start by opening any dark image.
Duplicate the layer and hide it. From image menu select "apply image". Apply settings as shown.

Color is very important to any design. Sometimes choosing a color palette or set to use is difficult. This is a method that will help you get started with picking colors.

Inspired by a close friend: a black and white image with particular parts colored.

Grab your images and lets give'em a makeover.

An updated coloring technique.

Give you car a paintjob. Older technique but it works.

This tutorial only touches the surface but it gives somewhat of an idea of what the Image/Adjust menu item can do for you.

Have your background black and white and your main model colored.

Give your cars some cameleon paint.