More to explore:
Bath mat from old towels. Fabulous idea. The towel mat will absorb wetness as you stand on it. Easy tutorial and video too.
Bibs from old tshirts
Re-styled tshirt... for you, @Courtney Woltemath
DIY Woven Circle Mat
cut and reweave the back of a shirt
t shirt cut out
DIY Geometric Cut-Out T-Shirt Tutorial
Empire cut Blouse, T-Shirt reconstruction with Tutorial
Eco Bath Rug Green-It-Yourself Project
Crazy rug from T-shirts. Cut in 1" strips, stretch and cut in 4" segments and sew to backing fabric 1" apart. Wacky crazy colours would be fun for a kids room!