I extended my wall of photos in the hall across from Jane's room. When Jane was 1 I made the photo canvases of her -- basically printed 12x12 prints and modge podged them onto canvases. Also glued strips of scrapbook paper to the sides then dabbed black paint around the edges. Some of the photos look better than others, and we've loved the Jane ones for 5 years now. They were hanging in a straight line on this wall that whole time.
I finally got around to making Livia's versions. Hers are mostly form her first year too, although I think the photo in the graduation cap might be just after 1 year old. Jane's are ordered from youngest to oldest left to right, and Livia's are ordered oldest to youngest left to right.
We mount them with 3M Velcro removable strips and they hold just fine, and allow for a little adjustments if they're not perfectly straight. AND we can switch the order of photos later if we want.
(I thought for sure I'd blogged about this when I made Jane's, but I can't find a post so maybe not. I'm not even sure what online tutorial I used to make them the first time. For Liv's I just winged it.)