I think you could certainly use pumpkin. Today I made a new batch with frozen chunked organic butternut squash and it was out of this world! I made it in the Vitamix with half the oil, and the color and texture are incredible! What I made was more garlicky than other hummus I've had, but I suspect every brand tastes a bit different anyway so that would be just personal preference. (And I've been looking for a way to get more raw garlic in, don't like it in smoothies or soups.)
Anyway, I've found me a raw hummus! I can't wait to offer it to someone to see if they can even tell it isn't beans.
I'd love it if you tried using raw fresh pumpkin. I've got a fresh butternut squash and I'll try using it next, to see if I like it as well as using the chunks. But the chunks can be available year-round so that's an advantage. (I presume they're actually raw.)
And yes, I color my hair. I looked at the Naturtint and have a bunch of questions about it. Do the results match the color on the box? (Of course, monitors don't always show true either.) Can it be used on permed hair? Does it fade over time so there isn't a distinct root line? Can you split the ingredients to make it last longer? Pray tell!