I wanted to try out making a mosaic to see how it would work. It was SO easy. I used the directions from Lily and the site pretty much walked me through it. I did link my Flickr account to the site just for ease of use, but it told me I didn't have to. One advantage is that once you have your mosaic created all the links to each photo are already done for you, huge time saver that!! I did spend sometime searching through Flickr and saving things to my favorite file. This made choosing the pics a snap. Now that I am an old pro (NOT) I advise you to give it a try. I will set up the group today for the Charming Secret Santa Christmas Swap and post the link to the group.
Oh yes, so here is my mosaic (credits for the pics are in the Flickr account photos)