Today I'm going to share some quick tips for making free photo collages. It makes you look like you did something fancy when you didn't. Score!
PicMonkey has some pretty amazing features for collages (most effects on the site are free and you don't even have to register to use them, but heads up that the Royale effects on the site do require a subscription). In the Layouts area, you can make collages in standard card sizes, ones designed to fit a Facebook cover spot, and Pinterest-oriented creations. The sizing area under the collage makes it really easy to change the size and lock or unlock your proportions.
iPiccy has a perfectly servicable collage tool, too, and everything's free there (so far, anyway). Just pick your template, upload your images and adjust spacing, proportions, roundness and more.