Grab big piece of cardboard, you may deside your own size.
YOU WILL NEED TO GLUE/TAPE THE PICTURES ON THE CARDBOARD.
First, cut out a lot of pictures from magazines, I used green and blue pictures because they're my favorite colours but you can also use pink or red ones.
If you're done with the cutting, start in the corner of the cardboard with glueing/taping the picture on it. (i used tape because there's a nice line between the pictures).
Now repeat these steps and puzzle untill the cardboard is full.
You can add some other things, but if you don't want to............... YOURE DONE!
I made this one water/ craft proof by covering it with transperant tape on a roll.