Have you tried the My Memories Suite photo tiling feature yet?  I really love this technique and use it quite often.  In the scrapbook page below I used a couple of features available in My Memories Suite.  First I changed the larger photo color to sepia using photos effect.  Then I used the photo tiling feature to separate the original color photo across three photo boxes.  Once the photo is placed in the three boxes you can ungroup them and then work with each photo box individually to tweak the placement of each portion.  It’s a very versatile effect and a useful scrapbooking idea.