Some of the fireplace manufacturer web sites have photo galleries -- you might try them. Here's a link to Fireplace Xtrordinair's. HearthNet.com also has one. Good luck! Here is a link that might be useful: FPX Gallery

I've done those tiny, miniature poinsettias on my mantle - a royal pain to keep watered and they must be daily. I've tried tiny topiaries (live) again a problem to water. All these things look great for a photo shoot, but for 2-3 weeks prior to Christmas and at least through New Years? Not so great. It's why so many have gone to fake greenery. What is available to the public is just so awful. Florists and designers can buy gorgeous stuff, but it's VERY expensive. The pictures one sees online and in catalogs usually have doubled - even tripled - the garlands to look lush and full. Then one must store these gigantic things. Last year, I used a 1/2 circle vase holder from the 1980's - it holds 5 very small cylinder vases. I put in cut amaryllis. I surrounded it with my magnolia leaves. They got a bit dry, but the amaryllis held very well and was easy to water. I'll be doing that again this year.

I don't think your mantel is wide enough to add decor along with the TV. See how much extra width the one below has? You could do just the long and low item underneath: But a quick Houzz and Google search show many designer homes where the TV is alone up there. I think your screen is fun. Another idea to add something to the overall look would be to cover existing mantel with a new one, easiest to do if you like the reclaimed barn wood look: How to make a slip covered mantel.

If you can find a window of the size of the shutters you can deck up the mantle like this You can also put a painting or a wall art in between and keep the shutter open. Or mount the shutters behind your couch. You can give them a rusty look or paint them in colors that go well with your other elements. If you do not want to put in too much time and effort, just paint them up and add some decoratives.