STYLETHREAD -- LET'S TALK SHOP!

I've never made a collage like that before, but I would go about it like I would scrapbooking. 

First, I'd pick a few pictures you want to use.  See if there's either a theme or a color scheme that is consistent throughout the pictures.  '

Once you've decided on a what that theme/color is, then you'll want to pick out some background paper that will highlight those colors and some other pretty papers to use to kind of "frame" the pictures--you'd cut out those papers about 1/4" larger than the pictures and put behind the pictures so they stand out a little more.

Then you can start adding other textures, mementos, and other stuff.

I'd recommend checking out either an arts and crafts store or a photo album store like Creative Memories where you can get your papers and other supplies:  http://www.creativememories.com/MainMenu/Our-products-and-services

You can also use these little clear "memorabilia packets" to put little mementos in:

Also, there's tons of software out there with cool fonts so you can type out your own phrases and words without them looking like magazine cutouts. 

I've done a ton of scrapbooking, and I think this is probably similar to making a collage, so if you have any questions, let me know.