For artistic names you could use unusual color names, like:
[name]Crimson[/name], [name]Auburn[/name], [name]Burgundy[/name], [name]Sienna[/name], [name]Cerise[/name], [name]Coral[/name], [name]Mauve[/name], [name]Violet[/name], [name]Scarlet[/name], [name]Azure[/name], [name]Blue[/name], [name]Cobalt[/name], [name]Cyan[/name], [name]Navy[/name], Periwinkle, [name]Sapphire[/name], [name]Teal[/name], [name]Emerald[/name], [name]Jade[/name], Lime, [name]Olive[/name], [name]Amber[/name], [name]Saffron[/name], [name]Lavender[/name], [name]Lilac[/name].
A lot of those double as nature names as well ([name]Saffron[/name], [name]Olive[/name], etc). Another way to get an [name]Art[/name]-related middle is to use the name of an Artist you like or admire, such as [name]Monet[/name], [name]Matisse[/name], Degas, Chagall, Dali, Renoir, Warhol, etc.
This link goes to an excellent list of unusual nature names: Unusual Nature Names
[name]Hope[/name] that helps!