Color Changer Tutorial
To do this you first off need a good photo editor. If you can;t find one, you can even do it on your phone using the PicsArt app. Find a good picture with a lot of different colors, and just like blacks, browns, or grays. Then go into your editor and in most cases you will find how to adjust the hue under color options. In PicsArt it is under Effects>Colors>Hue. Then adjust it so ALL the colors are different in your image!
Here is an example of what it should look like.