For what I understand you want to do I'd suggest a theme like Chateau or more like Imbalance 2 (there are others with that sort of magazine style, but those are the ones I'm most familiar with) because they both show lots of posts via custom excerpts so you could show many posts at a time with pictures of the classmates.
I'm assuming the two pictures would be "high school" and "today"?
I'd suggest using posts rather than pages because you can easily show them, edit them, and arrange them. Less cumbersome than pages. Plus you can make an index page without much trouble.
You probably don't need a complicated template. Just insert the two pictures both aligned left, followed by text. You might need a code snippet to make the text stay below the pictures, but that is simple to cut and paste as needed.
For the two themes I suggested, you would then copy / paste the two pictures into the custom excerpt field and voilá you have a page full of pictures of your (wife's) old classmates. You can set the number of posts to appear on your front page. I'm not sure if the whole class would be there, but it's easy enough to go back to older post pages…
Let me know if this sounds like what you'd like?