You definitely can! Here's what you'll need: a curtain rail and an IXXI.
Simply attach the curtain rail to the ceiling and assemble the IXXI. Replace the wall clips on the top row of cards with X-connectors. Slide the protruding parts of the X-connectors into the rail. That's it!
Tip: Want to check if the curtain rail you're considering will fit? Take an X-connector with you to the store and try it out to see if it fits.