Depends how artistic you are.
Level 1 - grow trailing plants over it
Level 2 - balance pots on it
Level 3 - create a scene with plaster rabbits etc, plasticine people, potted plants, bird house etc to amuse the kid in anyone
Level 4 - take a saw / chisel / drill to it and carve it up into a work of art - or more interesting shape anyway.

Place an obelisk/arch/frame around it and plant climbers ?

Use it as a plinth for a piece of statuary.

or a bird bath..

get a man in to carve it into something .