First, the easy part, ninja costumes are easy to find. For example:
Ninjas

Fruit can be a little trickier; first is the DIY route. This involves getting some oversized clothes and stuffing them. See here for a good overview:
Make your own fruit costume

The next option is to buy them, but this gets a little pricey and can be harder to track down. Amazon has a few:

These are a little more affordable, and pre-sliced which works nicely with the fruit ninja theme.
Watermelon
Lime

These are a little higher end.
Grapes
Pineapple
Lemon

If you really want to up the level of difficulty you can thrown in a smartphone either separately or for the ninja.
iPhone

Good luck, and enjoy all the extra candy!!

1. Who Represents is where you can find the name of the agent that represents any celebrity. Their web site is www.whorepresents.com.

2. Experts Exchange is a knowledge base where programmers can exchange advice and views at www.expertsexchange.com.

3. Looking for a pen? Look no further than Pen Island at www.penisland.net.

4. Need a therapist? Try Therapist Finder at www.therapistfinder.com.

5. There’s the Italian Power Generator company, www.powergenitalia.com.

6. And don’t forget the Mole Station Native Nursery in New South Wales, www.molestationnursery.com. (This one has been changed…and thankfully so.)

7. If you’re looking for IP computer software, there’s always www.ipanywhere.com.

8. The First Cumming Methodist Church Web site is www.cummingfirst.com.

9. And the designers at Speed of Art await you at their wacky web site, www.speedofart.com.

These are all legit! (Except number six…they got wise!)

Strange and offensive indeed, but who could blame them for their life long fantasy of being Chewbacca carrying around a broken C3PO?!?