I've never understood why so many people paint their basement walls in two different colors horizontally. The main effect of this is to visually make your already low ceilings even lower.

Ballet white can be a nice warm white, and I would just paint everything the same. Just a higher sheen on the paneling than the wall and ceiling.

Be careful removing the shelf you are saying you want to remove. If the block ends there, and the top is all stud walls, where the sheetrock it, that block forms a ledge, and you may still need to have a shelf there.

It looks like it will still need a ledge but it could be made as narrow as necessary to just finish the top o the block.

I would go with the same warm color for the walls.

The shelf looks like a plate rail (does it have a groove near the outer edge?). They are actually kind of nice for displaying artwork. They are most common in vintage dining rooms, where "plate rail" was actually meaningful.

I think Ballet White sounds like a good choice, but agree about painting the panelling and wall the same color in different sheens.

No, there is no groove like a plate rail.
I don’t care for it because it chops the room in half and it’s already a low ceiling. However, based on some of the comments here, I may be surprised to learn that I have a small ledge there no matte what. Let’s see when I take it off! Meantime I’m thinking the ceiling and walls should be the same color to make it one smooth look to the eye. Thanks!

We have a similar ledge around the perimeter, it’s actually part of the foundation. We’d have to reframe and drywall to get rid of it. There was like a shelf on top made of wood that we removed and replaced with drywall to make it less obvious. I think if it’s all one shade of white it won’t look weird.

I would go all white, matte finish for the gypse wall and satin for the paneling. Although the example below seems to have a very ligh gray with white paneling, it still shows the idea of white on white...

BM Pale oak

I think that rail could make the room. Highlight it, use it to create a few key focal points. Like @cawaps said and use it to lean your artwork on and be very interesting. What a great idea for gallery groupings of things like colorful paintings, plates, woven trays and frames. Add another shelf somewhere, hang things on the wall for depth.

Two words: Alien Tape. Pick some up and use a piece of it to secure the art. Believe me they won't go anywhere lol! You can use it to hang some pieces on the wall. Velcro works too. Museum putty.

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Interesting thought!

Great advice from everyone! Kept a shelf but made it smaller, smoothed everything out with BM Simply White. Very happy!

Never underestimate the power of paint! Looks great.