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.