My toddler loves painting, I give her 5 a4 pieces of paper and tell her when she has used it, then we have to tidy up. And she accepts this. She fills the paper with her art.
I have dedicated one wall in my house to her artwork lol.
I am working my way to completely covering it with paintings and then going to seal them with a water resistant sealant. I'm sure its going to be a talking point for years to come and its lovely to watch her showing people that come to visit.