I think it would be heartbreaking to paint them white. That original timber is absolutely beautiful and adds a sense of contrast and drama. I don't think everything needs to look light and bright. I'd be painting the walls they're on in a deep rich colour to make it tie in more Harmoniously.
Do it!! Brightens the space up so much. It still looks beautiful, the carvings are what makes them special & unique. I think they would look great any colour x
I think I have the exact same surround and have been thinking about painting it white for the same reasons you mentioned - yes the timber is lovely, but if your room is on the small side it can feel quite dominating.
The only reason I haven’t painted mine yet is because it looks tricky and I didn’t want to botch it.
I think they look beautiful with wood or painted white - lots of people paint them so even though I would go with wood myself I can understand being overpowering in a small space.