Yay or Nay? DIY Fabric Roller Blinds

I've been searching for months for ideas for simple window coverings that fit inside a window frame. So, when I saw this tutorial over at Design*Sponge I thought it might work for our small bathroom, but I wanted to ask...even if I was able to find an alternate use for the vinyl that would be *displaced* by this project (like lining the cat litter box or lining the space under our kitchen sink where our cleaning supplies are kept)...

If you're interested in this tutorial, check it out on Design*Sponge.

(Image: Design*Sponge)