Here's who I would like to see in Season 8, especially if its going to be the last season:
1) Jake, preferably with Jenny. Yes, I know he was with Peyton but I'd love to see him on a visit to Tree Hill and interacting with the Core 3 again.
2) Chris Keller. They probably won't be doing a big music storyline with Haley in S8 since she's expecting, but something minor would be great as well, such as the two of them doing a duet or two.
3) Dan and Deb. I want both of them to get some closure. End up back together again, maybe? And Nathan should forgive Dan so they can end up living together as a family before the series finale.
4) Rachel. Again, her character needs closure. So maybe they can bring her back, have her patch things up with Brooke, and then have her stick around to help with the wedding a little?
These are all I can come up with off the top of my head.