Definitely would be in for one or more Spyderco morale patches, as I have several things I could put one on. Simple design, with or without the Spyderco name, would be an obvious choice. "Bugged out" bread truck would be another.
As for hats, a new baseball style cap would be great, as would another military style cap and another beanie. However, for purely selfish reasons, what I'd like to see the most is a Spyderco knitted jeep cap as that's what I wear darn near every day in colder weather.
EDITED TO ADD: Two other items that might sell are web belts and suspenders. Web belts are a "one size fits most" item as they usually are over 50" long and can be cut to size. Believe The Suspender Factory has made custom designs for other companies in the past, might be checking wit them if Newsom ever lets CA get back to work.