If C had a dark border with lighter ribbon, it'd be my fave. I actually love all of them, as each color scheme evokes a different feeling. The red and green could be Yuletide themed.
Matter of fact, what about marketing all 4? Buyer chooses which they want to purchase and make. Maybe tweak them a bit (if you think any need it) to represent the 4 seasons.
I mean it's just 4 times the work...lol.
They really are beautiful!
Regards,
Kif