I don't know about you, but I am nutso about Dover Clipart, specifically the old wood engravings. I nearly fell off my chair when Jacquie told me that you can sign up with Dover and they will send you FREE images once a week via email. I ran home to my computer and signed myself right up. Sign yourself up here....
Another source for free vintage images is The Vintage Workshop. She sells image packages geared toward fabric crafting, but nothing says you can't use them on paper. Sign up for her email freebies here....
Don't be afraid to poke around both sites, they have a bunch of cool stuff to help you melt the old Mastercard, too.
If you are working on writing your artist statement, Jean sent me the link for this fun (smart-aleck) little utility to give you a hand with the verbage."