Green Stuff has an interesting tool that allows to build tentacles, tubes or wires.

Using your favourite putty or clay, this tool easily produces rolls with different patterns.

The set includes:
2 large plates
2 medium plates
2 small plates
2 guide bars. Use them to hold the plates and to get an extra 45º position for new textures.

They can be used to transform a figure, add details, decorate a scene...

You can read all information and see it in action on this link