Darken color of marble

We have had porch wicker for 15yrs. Originally painted white, I was able to get about 90% off. I have the spray gear -either air or airless- to shoot it, but do not know the paint to use. They sit out 24/7 with overhead cover. I'd appreciate anything suggestions. Jim

I'm about to paint my 100-year-old white-colored home. Previous owners sided the top, but not the bottom. I'm down to three options: 1. Strip the paint off the bottom and repaint white to match the top. ("easiest") 2. Remove the top siding (a project in itself) and repaint the whole house with a different color scheme. (way hardest) 3. Keep the white vinyl on top and repaint the bottom a different color -- most likely with a historical color pattern. (compromise) My question: I've seen houses with split colors (no.3), but never with white on top. Is that breaking a big color rule? Can I leave it white on top and paint the bottom a different color -- and make it look nice? Can someone show me some examples if they know of any on the net?