It's pouring rain out there, so I'm taking a night off from the tourist thing. I was poking around the Japanese Subaru website and found a page full of painted wallpapers by someone called Bow-san. There are 19 of them, and they cover models from the 1960s to today. Be sure to click on "My Subaru Collection" on the right for a couple more in the flesh.
http://www.subaru.jp/about/gallery/wall ... index.html
Looking around the Honda website turned up this page:
It's more wallpapers painted by Bow, but this time it's Hondas. Lots of good stuff in there, available in 1024x768, 1280x1024 and 1600x1200.