Creations: Max, arguably. But for more conventional forms of art, there's not really anyone doing so openly. The biggest market for works of art is religious, and most Cults would shy away from working with a Wizard if they didn't have to.
Performances: Circuses are often filled with magic-users, illicit or otherwise - illusionists, pyromancers, fortune tellers, animal tamers, strongmen performing feats of endurance. But a more outright 'come see the magic-user using magic' show, not really. Altdorf culture is to be performatively unimpressed with any use of magic, and outside of Altdorf the usual reaction is fear and mistrust.