"Steampunk Sourcebook" is a Victorian/Edwardian-themed clipart collection + CD ROM. The graphics are saved at various JPG resolutions and are the sort of thing you'll like if you do digital scrapbooking, making collages or are involved in some sort of retro-themed project. Despite the Steampunk title, these are really more like the images Terry Gilliam used in his Monty Python animations (although perhaps the plethora of geared pocketwatches and guns speak otherwise). If you've got a penchant for surrealism, you'll get a major kick out of this book and the graphics ought to inspire you. It's definitely a niche market but I think I fall into that niche.
It's amazing how creepy and weird these graphics are when divorced from what their original contexts were, and as an armchair art historian I wish that Dover included some of this context in this book. However, I was happy to see that Dover included some truly odd assemblages and collages made from these graphics. Again, this edges closer to what (to me at least) looks like late 1960s psychedelic collages but since I like that look a lot I am not complaining. The included collages, to my eyes, are quite beautiful and surreal.
True, you're essentially paying for public domain images but good luck tracking these down in their original sources and then verifying their status as free-to-use! I'd rather be spared the effort by buying this book.