craftgrrl | Hanging an Indoor Clothesline

I'd like to string up a "clothesline" (out of twine or clear fishing line - or whatever you'd suggest) to hang up some artwork (mostly 8.5 x 11 or 9 x 12 paper) with clothespins.

Problem is I'm in a rental and I'm moving at the end of the summer so I don't want to gouge the walls in a big way (a small hole that i could easily patch would be okay). So drilling into the wall or a butterfly bolt are out of the question. I'm concerned that a tack won't be strong enough to hold up the clothesline.

does anyone have any suggestions on other ways to hang a clothes line?

thanks much!