I think most of us know about the arrangement the SEC and ACC have created to allow for the following games to happen Rivalry Weekend:
Florida - Florida St
Georgia - Georgia Tech
South Carolina - Clemson
Kentucky - Louisville
Here are some others I'd like to see happen
BYU (Big 12) - Utah (Pac 12)
Iowa St (Big 12) - Iowa (Big Ten)
Colorado (Pac 12) - Nebraska (Big Ten)
Oklahoma (SEC) - Oklahoma St (Big 12)
Missouri (SEC) - Kansas (SEC)
West Virginia (Big 12) - Pitt (ACC)
UCF (Big 12) - Miami (ACC)*
*This last matchup is weak but maybe it can turn into something. Miami doesn't have a traditional rival available on rivalry weekend anyway.
Even if these could happen every second or third it would be awesome to see some of these traditional rivalries played at the end of the season.