Kontextür

I'm really loving these sweet shower curtain rings by Kontextür. Although my newly redecorated bathroom at home is a little on the classical side, if I ever do another, I'll definitely use these! I would adore putting these in a fun kid's bathroom. I wonder...could you also use these as little window curtain rings as well? 

Do you prefer the square edge neons, the opaque neutral bamboo style or the metallic rounded?