I experimented with pumpkin soup yesterday. I think it turned out quite well - though you'll have to ask some of the taste testers for an honest opinion.
Basically I cooked a bunch (turns out that half a pumpkin serves way more than 6 people) of pumpkin in the pressure cooker along with some carrots. On the side, I sauteed onions and ginger.
Mashed the pumpkin, mixed it and the carrots with whipping cream, some milk, nutmeg, black pepper, and a tiny bit of cinnamon and cooked in a pot for a little longer.
Finally, put it through the blender and garnished it with some parsley.
I want to try adding some celery as well - I think that'll give it a nice bite.