apartment therapy changing the world, one room at a time

Absolutely use it as an accent wall. You could paint it but how about this: Splurge on some very expensive and beautiful wallpaper.

I'd say cover it in one of those really cool Maya Romanoff wall treatments and make it stand out. (Bedazzle or True Metals)
http://www.mayaromanoff.com/

i would paint it an accent color, as well.

or those two ideas are actually better. ;-)

I think a very graphic and wide stripe wallpaper, hung on a horizontal, would be amazing.

Wallpaper.

Paint treatment of some kind...

Wall stencil...

And consider replacing those ceiling fixtures.

totally paint it as a focal wall, try wide (18-24 in) HORIZONTAL stipes that will really emphasize the curve!!
It can still be subtle if one stripe is the color of the wall as is, and the other is just a shade or two darker-even picking up the color of the floor-wrap the stripes further into the hallway ( L hand side) and you'll get a nice visual graphic or receding lines pointing in or out of your entrance!

a silver metalic paint or wall paper on the curved wall would really accentuate the deco feel of the curve.

Painting or wall treatments would be a great idea if the wall was facing a big light source like a window, but your floorplan indicates that the wall is set back in the darker corners of the entry way. It will never quite pop from color alone because the light source won't be large enough to illuminate the entire face of the wall evenly. I would suggest installing a recessed soffit light that runs the length and curve of the wall. This will create a soft glow at the top of the wall that will emphasize the curve and help illuminate whatever color you choose to paint the wall. Also, if the budget allows, I would replace the ceiling fixtures pictured with recessed lighting. This would help clean up the line of sight and help emphasize the wall as a design centerpiece to the room.

How about lights showing the horizontal stripes? In fact, you play up the dark as the background for a white (or light) large stripe winding around.

Or maybe a stencilled line stepped up repeatedly that moving upward and frames a picture at each step/riser? You'll have to stop the pictures before you get to the corner that isn't there, but that's the point! The stencil can complete the round corner.

Some evolutinary pics would be fun. Something evolving from one form to another. Perhaps the "ages" of man etc... Part of the fun of a curve is its symbolism of moving on endlessly. Yeah, I'm overly keen on symbols. Ah well....

I think that if you used a demi-lune table on a nearby wall, it might call attention to it.

One inch glass mosaic tiles.

Or I second bball's horizontal tone-on-tone paint stripe idea.

I have a curved wall in my entry also. I applied a carnival mirror (the kind that distorts your image to be either fat or thin). If you don't distort it, you simply have a mirror surface -- one that can BEND! And it's super cheap. You can buy carnival mirror in a roll for about $25 - $50 depending on size.