For all of them, I just put the seeds/nuts in a blender and blended them and bashed them with the tamper until they turned into a non-Newtonian fluid. The sunflower seeds and pistachios were already roasted and salted, and the peanuts were already roasted and I added a bit of salt and honey.

You need a powerful blender with a tamper for this, though: I have a Vitamix 5200 I bought off Kijiji (because new ones are extremely expensive).

I found that the peanut butter in particular was not really worth it: 1 kg of peanuts seemed to be roughly the same price as a 2 kg jar of peanut butter.