Jason, if you are doing these castings, I will say each is excellent! Obviously everyone will have a preference, but each is excellent, IMO.
I have done some casting a few years ago with alumilite and stamps and foil, so I appreciate the effort for these.
For "my" preferences... I like the natural end castings vs the side natural grain castings. I hope this is understood?? . The ones you displayed I like! - natural end casting.
I'll also vote NOT for the green or the orange. The darker colors seem a bit more appealing to me. But School/University colors may be important to the buyers.
Beyond all other comments - Very nice set of pens! And I hope you are healthy and secure.
Thanks for sharing.