This link from Photojojo will make your photos look like they were taken back in the early 1800s. The Japanese website will upload one of your photos and 'wear and tear' it for you. Don't worry that the page is in Japanese (or garbly gook if your computer doesn't have a translator) Click on Browse, select your photo and then press the blue button underneath your picture with the 7 squares on it. To save the changed picture, I right clicked and selected 'Saved Picture As'. I don't know what the photo quality would be like if its printed.
The Before Picture
The After Picture
Maybe this wasn't the best picture to use because of the grassy field but I wanted a picture that wasn't obviously present day. Let me know if you get a better result with one of your photos.