Oooby and also got two lots from someone on Freecycle. I find their juicy, sweet, tart flavour irresistable and am always suprised that some people don't like them. Some people love them so much they eat the skins which are a little sour for my tastes, but I have devised a way to get more of the goodness out of the skins before I compost them.
Fermented Feijoa Drink
I loosely fill a 1.5 litre sealable jar with the empty skins, then fill it almost to the top with water and add about 1/4 cup of sugar (I'm using organic fair trade sugar, but I guess honey would work too). I started off using kefir (converted milk kefir) to ferment the feijoas, but then realised that the powdery stuff on the feijoa skin is actually yeast and the kefir grains weren't doing much. The flavour leaches out of the skins, along vitamin C and other things, I assume, and makes a delicious feijoa tasting drink in a couple of days. When the weather was warmer it took two days on the bench to get to the fizzy-drink stage but now I'm experimenting with putting them in the hot water cupboard after a few less fizzy brews.
I've also tried chopping the skins up into small pieces and cooking them in honey for a while - it creates a sort of glaze which would be great over a cheese cake, or it could be poured into a jar and consumed as marmalade. My daughter loves eating the glaceed feijoa skins - she's convinced they're candy.