quillio- Okay, I understand what you're asking
My FI and I went through this issue a while ago, so we understand. Since we both had overall good relationships w/our respective chapters we still wanted to keep that connection yet we knew we didn't want our place to double as a dorm room. One thing we did is put our most important stuff (big/lil paddles, special pics) in a designated room, which in our case was the computer room. Our favorite pics went into nice subtle frames (you know, not the kind that have the giant XYZ letters on it, heh) that blended well w/our family pics. So, just mingle his pics w/yours!
Now, I have a ton-o-lambs from my time in my sorority. If you have a ton of the plush stuff I'd advise you to keep a handful and give the rest to the younger members!

Oh, and just get an album or two to keep the rest of your "college" pics, c'mon, you thought you were going to keep those high school pics forever, didn't you?