Change the image in graphics editor

There is an origin image that should be changed. It should be similar. Need to change color, write a text in other words, change percentage (1-2% more or less). Small pictures should also be changed - you should find them by yourself (e.g.a picture of man, map, a car). All parts of the picture can be replaced. In the total the picture should looks totally different. In the resul we'll need image in graphics editor format, so we can change them any time and in usual file format.