A "mood board" of inspiration images could be an interesting input method. With deep vision models, we can already separate different "levels" of concepts: a high level subject ("person riding a horse"), textures (the horse hair), medium (painting vs 3d rendering vs photograph), etc. It'd be interesting to have a "smart mood board" that goes from text prompt, to visualizing that hierarchy with different options. Then the user could interactively increase or decrease different parameters, ultimately iterating alongside the computer to realize their creative vision.