I moved to a new house one year ago. The new house is by far smaller with less space for storing things. Therefore, my towels have been hanging around the bathroom till recently, when I decided to make this case. Unfortunately I have not got a detailed tutorial for this. I am posting just to give you an idea.
What you need to make this is fabric and a cloth hanger. Cut a piece of fabric as long you wish your case to be and then a smaller as you see at the picture below. Sew where you see the pins. Be careful and do not forget to leave the hole open for the hanger to pass through.
Then you cut pieces of fabric and you sew them on your background. I cut smaller pieces than what I needed which makes difficult to put the towels in, but anyway the important thing is that my towels are very well organized now.
I promise that my next projects will have a more detailed tutorial