Here's what I used the first time:
4 stalks of celery
3 carrots
1 green apple
2 handfuls of spinach
I had to throw some ice into my glass but other than that it was really good and it is actually quite fun to throw different combinations in and see what comes out (kind of like being an evil genius working in a lab).
Does anyone else juice and if you do, what are your favorite recipes?