Not sure where I got this idea - I think it was in a cookbook? Anyway - loved it, and thought I'd share it with you!
You know when you buy fresh herbs (or grow them in your garden for those of you who don't live in a shoebox like me), and you just know you're not going to use them all in time? Well, what I've started doing is chopping them into ready-to-use sizes, and then freezing about 1 tsp of the chopped herb into an ice cube! Then, when I need fresh herbs, all I do is throw an ice cube into whatever I'm cooking! This will make me feel a lot less guilty about spending $3 at the grocery store for sage that I'll only use a little of. :)
Mine happen to be heart shaped, b/c that we have an automatic ice maker, and those are the only ice trays I own! :) I bought them for a party once, and they've turned out to be very useful!