Home field advantage and unique differences, similar to MLB ballparks
NCAA has relaxed its stance on uniformity and adopted the model MLB has for unique fields. However, they really went the extra mile and has given each team full creative control for whatever changes they want to apply to their fields.
Fundamental rules of football are the same but each field is varied. Think “this is a home run in 22 ballparks” but in football terms. Changes can be size, surface played on, etc.
Ones I’ve considered:
Iowa: football field is extended out to a mile long. Good luck scoring. Punts all day, err day.
Georgia: remove the grass field and play on asphalt. Hash marks use similar lines and colors as your standard road/highway. Sideline has metal guardrails. Traffic cones in place of pylons. Maybe throw in a concrete divider in the back of the end zone for funsies.
Army/Navy: Both want the field to be the size of a 10X10 room. Eliminate the forward pass unless you want a goal line fade route.
Penn State: regular field but concession stands have crayons for distraction and consumption