Really? Did Boise get grand-fathered in?
Edit:
According to Wikipedia, this is an urban legend:
Blue turf myths
There are many myths about the blue turf. Two of the most prevalent are:
There is an NCAA rule banning turf colors other than green, but BSU's field is allowed to remain blue under a grandfather clause.
The NCAA has no such rule; any school may paint its field any color other than green if it wishes. Though painting the end zones is common, and schools have wide latitude in how to do so, only BSU has chosen a non-green color for the field itself.
Mistaking it for water, birds have flown into the blue turf.
This has never been confirmed. In 2007, Broncos coach Chris Petersen claimed to have found a dead duck on the field, though it is unclear whether or not the duck had mistaken the turf for water.[12]