Which RPG has the most inspiring interior art?
This is another one of those 'define your term' questions, because inspiring to whom? Inspiring to what? Are we talking about me wanting to build a cool-looking character? Then I'm not sure anyone can beat Paizo's Pathfinder work, or the 4E core rulebook art. Inspiring to really get into the tone of the game itself? Then the particular aesthetic of the powered-by-the-Apocalypse games (notably No Rest For The Wicked, Dungeon World, and the core Apocalypse World book) are on-point for that, as is the incredible Flat Pack and Maschine Zeit. Inspiring to me as a player about the experience of playing RPGs? Then Fate's core rulebook, with the gamers of colour and the disabled gamers is really inspiring to my heart about the hobby, as well as Breakfast Cult.
What about you? What are you inspired by?