Neat tree, I'm hoping to add flowering varieties in my current collection of bonsai. Regarding the pot, as my opinion, I think it should be a matte natural color. I think the flowers are the biggest appeal of a cherry bonsai so the pot shouldn't compete with the main highlight of the tree. A shallow circular pot in an dark grey or earthy color--maybe with some texturing would great. Then again all my current trees are still in training and at least a few years from placing in a bonsai pot so I don't have much experience in this matter.