If you have a "floating ceiling" and you want to hang things from the bars and dont want to pay for the hooks, you can always use a box of paperclips to do the trick.
All you need is a paperclip and about five minutes.
Step 1: The hook for on the support
First thing is to take the paperclip as shown in the photo.
Note: Notice the orientation of the paperclip
Bend the short piece of the paperclip down 90 degrees.
then bend the longer piece up 90 degrees