I am also a dash of this, pinch of that person
I use my food processor, and throw in these things to taste:
* chickpeas (rinse them to reduce the salt)
* black olives
* jalapenos and/or green chilis
* some olive oil - to smooth it out
* spices such as: red pepper, garlic, lemon seasoning, celery seeds, poppy seeds
* fresh cilantro is good
Rather than buying tahini, I'll usually put in some kind of salad dressing, often a vinagrette or basalmic vinegar. We often have a little leftover raspberry salad dressing, or some other unusual flavor, and it makes a nice change.
If you're wanting to increase daily servings of veggies, you can put in things like broccoli, too; I find fresh veggies in small quantities practically disappear in the hummus.
In a pinch I've experimented with other beans, and the above with black beans, or a combination of beans, is an interesting dip.
If you don't have time to let the hummus sit, you can release the spices more powerfully by zapping the end result in the microwave, btw
This is especially good if you've put in your own chopped up red peppers - I've done that with what we grow, and wow! that packs a punch.
I make this so often it's less than ten minutes from start to finish, since fortunately our food processor is an easy-clean one.