Vintage illustrations are great for using in crafts, especially as they are copyright free! Sites such as thegraphicsfairy.com has hundreds of amazing illustrations to download and use in your projects. The site is really well laid out with the images split into various categories and also projects to try. It is a treasure trove of hidden gems!
I love using their old illustrations in my items, especially my badges! Here are a few examples. Clicking on the images wil take you to my etsy shop.
All the images on graphics fairy are free to use in all your commercial and personal projects because, as far as the site owner knows, the copyrights for the illustrations have expired.(Graphics fairy does not wish people to use more than six of their images in any one project however.) If you use images from old books or other sources, make sure you check the copyright first! Copyright expiry is usually 70 years after the death of the artist.
The Paper Pocket Watch 