A YEAR IN REVIEW PHOTO COLLAGE?

I just happened to scroll back through this years photos, looking for something in particular, and it made me realize what an amazing year this has been.  Can you believe that it has already been a whole year since the moving van loaded with all the stuff from our Houston townhouse showed up on our doorstep here, and my hubby became my fulltime housemate at long last?  Anyhoo, it got me to thinkin' that it would be really cool if I could do one of those photo collages here -- the ones that show snippets from all the important things that occurred over the last 12 months.  Only, I don't know how you do that.  Can anyone give me any hints?  Is there a gadget for this?