I’ve been playing with this cool website for the past few days. Tiltshiftmaker.com lets you upload a photo and then automatically apply a tilt-shift effect. It basically makes your image look like a photo of a miniature model.
When your file has been transformed, the site will let you download it. Unfortunately, it also resizes it to 72ppi, so you can’t print from it. However, I found a tutorial on Design Pitstop that shows how to get this same effect using Photoshop. Have fun!