If you have a green sock you could make a sock puppet that looks like a crocodile or a monster. Use some different coloured felt to make spiky fins along its back, and glue on a nose and a mouth as you have done with the dog.

Or use a grey sock to make a shark. Line its mouth with red felt and add some grey fins. Don't forget the sharp white teeth inside its mouth!

When you have made a series of sock puppets, design and make a container to keep them in.