Toast, celery, apples, put some sliced bananas and spread on some bread for a sandwich. Yes, you can have crackers just read the labels. There are cheese flavored earth balance crackers that would be good with peanut butter. I'm sure cashew would be good too although I've never tried it. You could make no bake granola bars as well.
I don't know about cashew butter since I am highly allergic to cashews, but if I wasn't going to die a horrible death from anaphylactic shock, I might spread that or peanut butter on a toasted bagel, an apple, or a good piece of toasted bread.
I use a lot of peanut butter on all of the above suggestions. I haven't used cashew butter but macadamia butter ( made by a local macadamia nut grower ) is absolutely delicious. Not an over powering flavour so makes a great butter substitute for sandwiches etc