When I was a kid, coloring books were generic compilations of things like animals and trains that you colored in at school.
Nowadays however, you can make them much more personal thanks to tools such as ColorizeYourPhotos. ColorizeYourPhotos allows you to turn your photos into coloring-in tasks for kids, making things more fun and relevant to your precious ones.
Using ColorizeYourPhotos is easy. Simply load a picture into it, select the amount of detail you want to color in and you're done! Using a slider, you can configure how much black and gray you want in the image. When you're ready, use the buttons at the top of the interface to Print or export to PDF. Unfortunately, you can't export to any other formats such as DOC or PNG though.
ColorizeYourPhotos is a clever and simple way of making coloring-in more fun for your kids.