I did this one time, i put an apple and a orange in a paper bag with the avocados, and it helped them ripen faster. I guess the fruits give off some sort of chemical that helps the avocados do their thing.
Also, a few avocado things u can make:
Gwak a mole eh - Mush those suckers up with some lime juice, sour cream and a salt and pepper. Yum.
Sub for Mayo on a sandwich, much healthier too.
Add them to a whole grain tortilla Queso dilla.