My partner's wonderful idea was cute tape decorated jars. She brought some small baby food jars with the labels removed, masking tape and liquid shoe polish.
The girls tore tiny pieces of masking tape and stuck them all over the jars until they were completely covered. Some girls even put the bits of masking tape on the lids.
After the jars were completely covered, they sponged the liquid shoe polish over the masking tape.
It created a really nice effect, resembling a cracked river bed or reptile scales.
The tape could even be cut to specific shapes to create even more elaborate designs, if you have the patience for that!
The pictures are on my partner's camera. I hope to be able to add them soon!