Supplied you'll need:
Large craft letters (mine are wooden)
Pictures and scissors
Modpodge and brush
Step 1: Get your letters, and if you want, paint them. My letters came from Michaels, and I painted mine orange because that's the Centrikid color.
Step 2: Lay out your pictures how you want them. Some if mine I cut out all the way around the person, some I only hlafway cut out the person, and other's I didn't at all. I just depended on how I needed it to fit.
My process was to use tape to tape each picture down where I wanted it, not worrying about excess hanging off the edge of the letter. Then I flipped it over, traces the letter, and one picture at a time cut off the excess then taped it back into place, that way I didn't forget how i had it placed. Then once everything was trimmed I double checked to make sure it all looked good. I actually have to reprint a few of the pictures because I ended up moving them after i trimmed them. But no biggie. Once I was happy with the placement, I used modgepodge to glue them down. So it looked like this.
Sooo, this is what it looked like when I finished!! It turned out better than I expected because I was having a hard time getting the pictures placed right.