I don't think you need to limit yourself to vinyl as it's a pretty protected wall. Wallpaper is hard. There's too much GOOD wallpaper. My tastes are probably way off but I'd check out Bradbury's Art Deco papers (but look at their 50s, 60s, and Japanese lines).

Fish wallpaper is never wrong (Osborne & Little's "Derwent" comes to mind but there are a lot that are just as good), but not terribly geometric. There are papers based off Hokusai's famous wave that would be very cool (and get some serious blue into the room). Grasscloth would be low key and earthy.

Just be sure to get something a little weird and unexpected. It's a great place for wallpaper. Don't be too safe.

Perhaps painting the wall and placing some items (sculpture, plant) on the two lower cabinets that have glass fronts would be nice.

Anything too wild might be distracting when watching the TV.

If wild wallpaper distracts from the TV, shouldn't you watch something else?

Funny that I posted after vpierce suggesting not too wild....

How about a mural wallpaper? I also like Lawrence Sprowls attached photo.

If money is no object, checkout Timorous Beasties wall coverings. They’re British, very modern & very $$$.

Even though you’re at the beach, a typical beach themed wall covering could become cliche. And would look strange against your modern decor. Keep it unexpected!

Thanks to everyone for their input., there are really nice ideas Any recommendations on where to look for the wallpaper?

Not wallpaper, but maybe wood look laminate flooring or StikWood

Whatever you do, you'll have to run it on the wall on the right because there is no longical place to stop it.

First lower the TV it should be where the center of the screen is at eyelevel when you are seated. IMOadding wallpaper to that space will not look good at all, add a sculpture to the cabinets on each side and a large piece of art on the right wall and paint the wall behind the TV a color that works with the art.

Larger TV would work better in the space.

yes thats on the list thanks,

We supply 3D wall panels that can be glued to the wall. If there is a company near you then it might be worth considering over wallpaper as it has some depth to it. They can be painted to any colour.

you could always just do a backing like they've done here. I'd also mirror your left side to the right. that empty column on the right looks 'off'.