The Graphics Fairy is a blog that mostly caters to crafters, but I think anyone who likes vintage pictures and art should try and use this as a resource. There's a lot of unique vintage graphis that you can find there, and they also have links to neat fonts you can use as well. The best part is that everything is free on that site, but they do have a couple rules. One of those rules is that you cannot use more than 6 of their graphics on a single page of your blog or website. There's also the fact that all their images are in .jpg, so you'll have to go through some additional work to make it .png if you like transparent images. Despite those two downsides I highly recommend trying out this site if you like vintage graphics.