What a wonderful concept! I think this kind of realistic whimsy is exactly what sells these days. Your scissors are wonderfully done - I thought the rock was a potato until I read your rock, paper, scissors line though. Perhaps some crack type lines in it even if the model doesn't have any would suggest a rock more. It's the tannish color, the shape and those specks/indentations combined that look like a potato as the specks look like potato eyes. Once I knew it was a rock, I could see it as a rock though - guess I just have to deal more with potatoes than I have to deal with rocks so that's where my head was at!