The most precious things I brought back from my European wanderings were these 2 books. I bought them both not so much because I needed them, but because I wanted them to remind me of where I was at the time and how I felt. This one I can't even read, as it's in Dutch (I am so very practically-minded!), but it has techniques for drawing elves, fairies and their environments, and I got a lot of ideas from it. Not to mention it's so pretty I picked it up and looked through it every day since I got home.
And this one has a lot of patterns of character dolls. The faces are horrid, but the costume patterns will be very useful for my future projects.