What you needPlaster of paris
Start by making up your plaster of paris using the instructions found on your brand of plaster.
Take your plastic icecream container and fill it between 1cm and 2 cms thick with plaster of paris. Any less and you risk the plate being too fragile.
Once the plaster as set pop it out of the mold and choose the smoothest side which should be the side that was on the bottom of the container.
Take your paint and paint on a design that suits your decor.
I simply added a Asian character but you could add a decal, printed image or just leave it white.