If you're looking for a way to hang a curtain, you're likely to find the proper hardware from track manufacturer Kirsch. Their website isn't so helpful, but much of what they have available can be found online at Curtain Fair or locally at Zarin Fabrics, at 314 Grand Street.
Many of their ceiling-mounted tracks can be bent to any shape, as long as the radius is greater than 12". Most come in either mill-finish aluminum or white. Ball-bearing carriers with hooks can hold window treatments or room dividers - whatever you can dream up!
And hey, they have shower curtain tracks, too!