Rock, Paper and Scissors images are from https://www.iconfinder.com/
(they are still striped, as printed on the website, since I didn't pay for them)

Spock image was found here http://all-free-download.com/free-vector/download/spock-star-trek-cartoon_52494.html

Lizard image was found here http://www.symbols-n-emoticons.com/2014/07/likable-lizard.html