If it were me, I'd install three pairs of louvered closet doors and mount them so they simply swing out on pivots (not bi-fold). And I'd paint them to match the walls.

Why not just get rid of it, paint it and place a console and mirror in its place? Right now it looks like it’s being used as a multipurpose catch all. Covering it with doors will make the area have a LOT of doors and might be awkward to use.

Make it a pretty focal point since it’s what you see when you walk in.

Excellent point that it would have a lot of doors I didn’t even “see” that. It’s a large area..... i like the area for storage but hate that you can see everything but you are spot on. Too many doors in a row!

loras-

So you are thinking of trading storage for a blank wall?

No I do want the storage....I love having the storage. I agree though if I add more doors that whole area upstairs which is just 2 bedrooms/loft area would be 5 doors in a row. how can I keep the storage and hide the ugly book shelf.....on the east side is another large linen closet with bifold doors.

if you need the storage, what about doors on just the bottom half of the bookcase? I also would look into framing the bookcase with moulding and painting it and the neighboring doors. Then think about styling the upper half.

Since you don't want to lose the storage.... I'd see if I could figure out a way to go with a variation of kudzu's idea, but instead of louvered doors, I'd get solid doors and paint my own triptic on them! If you or friends aren't artists, you could find a really cool fabric you like and cover the doors hung as kudzu describes. You'd effectively be making a huge fabric triptic -- a google image search will show what I mean.

I agree that adding doors with the same finish as the woodwork would be very busy...which is why I suggested painting them to match the walls.