I'm not a big fan of juicing as I think you lose one of the main benefits gained from the fruits and vegetables, the fiber. But, if you are, here's a suggestion on what to do with the fiber. I made a clear green cucumber gazpacho a while back and had a lot of leftover pulp (I did put fresh vegetables back in the clear gazpacho before I served it, so everyone did get their fiber....don't want to be hypocritical). I know that people that juice use a lot of citrus, so if you want to use the pulp from juicing, pull out your pulp before you juice the lemons, limes or oranges as they are a bit too bitter.
3 cups pulp
Add 1/2 cup each of the following:
brown rice flower
1 1/2 tsp Sea Salt
Lots of cracked black pepper
As much water as you need to make it spreadable and more like a VERY thick pancake batter
Thinly and evenly spread this on a cookie sheet lined with either parchment paper or silicon pad (silpat). Bake in a preheated 125° oven for several hours (or until everything is dry/dehydrated and you can break the sheet into cracker size pieces). If you want, before it's completely done baking and still a little wet but has set up a bit, use a pizza cutter to cut the size you like. Don't use a knife if you're using silpat as you'll destroy the pad.
You can bake these at a higher temperature, say 250°, but you do have to watch it as you don't want them to burn, especially around the edges. Alternatively, if you have a dehydrator you may use that as well.
This goes really well with my Hummus Recipe (click here)