Check out the video of the stand in action.

We will need:

• two chopsticks (I used wooden ones, were delivered along with some nice food),
  
• some string, about 1m (I used some string for kites, found on the beach),
  
• an old ballpen.

I drilled (using my pocket knife) a hole in the bottom of each chopstick, and orthogonal to that a whole into the top of the stick. Next I took the casing from the ballpen (the grey and green thing). Now, fiddle the string through the wholes and the ballpen, tie a knot at the end, and you are done. The string basically follows a figure 8 pattern - at the bottom the string starts, goes to the ballpen casing, through that, up to the top of one stick, to the other top, goes back down to the casing, back through it, down to the bottom of the sticks.