I threw this together and it was really good so I plan on making it again.
I diced up a couple cucumbers, a couple tomatoes, and some sweet onion. Green onion or scallions would work too. Then I tossed it with some Italian dressing and let it sit in the fridge for a couple hours so it would make a nice juice and let the flavors combine.
I made a box of couscous and once it cooled I tossed it in with the cucumbers, tomatoes, and onion. You could add other stuff. Broccoli would be good.
Again, I let it set it the fridge for a little while, but you don't have to. It was pretty tasty.