Cover up built in shelves?

Hello,

Just wondering if anyone has ideas for how we can (if possible) cover up built in shelves in our lounge room? You can see a pic here (on the far right with ornaments): http://www.allhomes.com.au/ah/act/s...erra-living-room/14139864962211?lid=168488831

It would have been great if they were on the opposite (left) wall instead. I think they will likely remain empty due to how I would like to furnish the room and may look weird so I'd prefer to cover them up if it's simple and cheap to do. Maybe put plaster over it - I'm not sure.

Thoughts?
 
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