There's a few ways that you could do this. You could either have a sprite with the image of the rock, paper, or scissors with the visibility set to false, and then when one is picked, you set the visibility of that image to true. This would probably be easiest.
You could also make a sprite sheet where each frame is either rock, paper, or scissors, and then make an animation for each one. You would then play the animation based on whatever the choice was. I hope this helps, if not Just tell me so I ca hopefully clear it up a bit.