Here is a novel little tool. The Paper Potter is a wooden device designed to make producing seedling pots from old newspapers a doddle. Being biodegradable the pots can be planted straight into the garden without harming the roots, once there it breaks down naturally.
Making the pots involves wrapping strips of newspaper around the former and then twisting it on the base to seal the bottom.
The Paper Potter is available from Harrod Horticultural, Greenfingers and various Amazon sellers.