I got two images from google, Superman and a cannibis leaf, I then used the magic wand tool to make the image I wanted cut down to the actual size of the image, I then played wabout with the main colours on Superman to make all the red go green in relation to the cananbis leaf, I had to scale the leaf down to make it look like it was Superman's logo. This is my outcome

As you can see the original Superman would be red and blue, he is now green and blue with a cannabis leaf as his logo.