There will never be another sale of large pannier lids from Phil's Pannier Service Center.
I've gone to a combination of rough sanding, satin black spray paint and stickers.
I've got Iron Butt legend Bill Thweatt's "My Local Riding Area" decals on both panniers. a Four Corners Ride decal on the right pannier and a "There's Absolutely No Excuse For the Way I'm About to Act" John Ryan commemorative decal on the left pannier, plus Twisted Throttle's reflective triangle stickers on the back of both.
If I had it to do over, I'd use bed liner spray on as the base color.