Recycled Towel Rug - I would plait it and then sew it together with an actual towel strip, not thread.
32 Brilliant DIY Rugs You Can Make Today!
Easy DIY Rugs and Handmade Rug Making Project Ideas - Shower Curtain Rug - Simple Home Decor for Your Floors, Fabric, Area, Painting Ideas, Rag Rugs, No Sew, Dropcloth and Braided Rug Tutorials http://diyjoy.com/diy-rugs-ideas
Use the Trellis Allover Stencil from Cutting Edge Stencils to create your own shower curtain! this would be perfect to take canvas dropcloths and stencil on them so I can have floor to ceiling curtains in the downstairs bath