Creating a specific look with curtains?

I would like to imitate something similar to this. http://trendslidingdoors.com/wp-content/uploads/2011/12/Sliding-Glass-Doors-Curtains.jpg My living room has sliding glass doors taking up an entire wall and I'd like to put curtains over them so they stop taking away the "mood" I'm trying... show more I would like to imitate something similar to this.

http://trendslidingdoors.com/wp-content/...

My living room has sliding glass doors taking up an entire wall and I'd like to put curtains over them so they stop taking away the "mood" I'm trying to achieve.

My main question is about the top of those curtains. The fabric is wrapped around what appears to be a box with three sides. What are your suggestions on how I can achieve this? And do I hang that part separately or on the curtain rod itself? If there's a name for whatever that piece is please let me know!

A couple things to keep in mind.
I live in an apartment so I realllly need to limit the number of holes I drill into the wall.
I can't take down the vertical blinds, it's a big no no. I suppose I might be able to get the managers permission but I wouldn't mind keeping them pulled open so they're hiding behind the curtain. Of course that means everything has to be bigger and sticking farther out from the wall..... >.<
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