I have so many random pieces of paper with various links for free images that I thought I would finally take a moment and create a post so I would have them all in one spot. The first one and very well known is The Graphics Fairy . Karen has DIYs, projects, images for transferring and instructions for transferring images to a myriad of objects, 12 methods for transferring images. Some topics in her gallery: Ads & Labels, Birds, Children, Coca Cola Ads, Couples, Ephemera, Holidays, Flowers, Fairies & Angels, and a few more. Make sure to visit her blog.
Next up is Vintage Images, such a variety of images, I'm sure you'll find exactly what you need or something very similar!