What to do with aging grapefruit?

In December, I impulsively bought a crate of grapefruits for charity from one of my students....they are STILL in the fridge and starting to look a little less fresh and delicious.  So my friend Helen (another victim of the charity selling grapefruits) recommended that I make a Grapefruit Yogurt Cake (Ina Garten's recipe featured on smitten kitchen blog).

See you later grapefruit...hello tasty breakfast / dessert bread!  Wouldn't it be great with some fresh strawberries on top?

Do you have any ideas for elderly grapefruit?  Please share!

Please let me know, there are quite a few to use up before their rapidly approaching expiration date!

M