It's no secret that photo-developing tools abound. One which I recently tried out was photobucket. You upload your photos, to a location which is presumably safely and secure, and then you can 'tweak' them.
In the picture on the right you can see the original cupcake photo on the top left, then there aer three different alterations;
Cross process, Blueprint and Cartoon.
There are plenty of other tools to help you make the photo more 'retro' 'beautify' or add a splash of color. It's a lot of fun, and one good photo can be used in lots of ways; invitations, school assignments, even download, print and frame it as a gift or for yourself.
My only caution is that it is time consuming. You will soon find yourself experimenting with every button and option, and each adjustment takes a moment to download (with a video-add to keep you company), and those random moments and downloads quickly add up.
The upside is that it's free; you don't have to be a computer wiz or a professional photographer, just have a go.