The bigger the hair, the closer to God

For seriously high hair, I swear by Aveda Pure Abundance Hair Potion.  Use this powder at the roots when your hair is still damp and blow dry - you won't believe how thick and BIG your hair will be.  And to freshen up day-old hair, just add more powder at the roots (wet your roots first so the powder won't leave a white residue, flip your head over, and blowdry for just a minute or two). 
It may not be appropriate for the office, but it's perfect for game day!