My friend has something very similiar to this on a large tree trunk out side her kitchen window. It really is very sweet...she actually also has a few small windows and door lamp that lights up. I just find the whole thing charming and I am sure a small child would find delightful.
weed-smothering ground covers: plumbago (Ceratostigma plumbaginoides, zones 5 to 9) This plant grows well in sun and part shade in all kinds of conditions all over the U.S. It chokes out weeds, blooms in a clear blue that reflects the summer sky and tops it off with fantastic fall color.