For years, I wanted an ensuite off our master bedroom. Then I won a free bathroom from Mico Wakefield in a competition! But the space I had was very small and had to be multi-purpose (read the story in the Homestyle magazine at http://www.homestyle.co.nz/renovations/ensuite-chimney
The last thing I wanted was a shower curtain rail at head height in the tiny space. There are commercial solutions out there which are similar to this, but I could not afford them. So I had to invent a low-cost way of keeping the shower curtain and rail out of the way when the shower was not being used.