Both of the Hellboy movies have steampunk aspects, although the second is more obvious about it. You could also read some Lovecraft, as he often ties in with Steampunk (and Victorian) stories; so does Holmes. Here are some of the novels listed by Wikipedia as Steampunk. Here is a book of short stories that combines Holmes and Steampunk. Girl Genius is supposed to be steampunk (I haven’t read it). A lot of Elizabeth Bear, Neil Gaiman, Philip Pullman and Chris Wooding have steampunk elements. Here are some art objects that might give you some inspiration. Some short films that are listed as steampunk. Links galore. Beautiful steampunk-style watches. A quick search on DeviantArt will yield hundreds of results. And, of course, there is the Steampunk Dalek and the Steampunk TARDIS. I think it’s enough to get you started!