We have made a bank wrapper with a sketch of three Sparks holding hands printed on it. The Sparks coloured them in as they wished. These were used to collect friendship pennies. Alternately, the girls could be given the blank wrapper and be challenged to decorate it with a variety of crayons, felt markers, glue, sequins, glitter and feathers for example. Each girl ends up with a unique bank this way.
Glue sticks work well to position the wrapper.