One place I almost always visit when I am looking for kid projects is the Crafty Crow. I saw these there and fell in love with them.
We used a few toilet paper rolls but only had two. So I made a tube out of a cereal box. Worked beautifully.
The one on the bottom looks like a crab doesn't it? My daughter, who always aims to think outside the box thought of it. As soon as she placed the eyeballs on it became a crab to me. Love it.
My seven year old did pretty good. She is pretty dexterous with her fingers and just loves projects like this. Me too!