I'd probably like the contrast myself but putting that a side, it's critical to get the rings absolutely clean and oil free. Might even have to apply blue and rust remover to get a clean surface. Also might help to sand them to get some texture. Rings are generally quite smooth so any paint would have a hard time sticking. If you have access to a bead blaster that would be the ticket. Avoid the scope contact area but blast everywhere else.
I have no experience directly with it but there are some paints that you bake after application. No idea, it might be more expensive than new rings.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."