tutorial for faux leather but it would also work in a situation where you didn't care if the fabric frayed or with souvenir tshirts.
Fabric Fuse Modern Hexagon Pillow Tutorial
I'm picturing this done with squares cut from "souvenir" tshirts.
Charise Creates: Spring Butterfly ~ block coming soon...
Pinwheel Garden - pattern and or kit for sale
Primitive Gatherings - Pinwheel Garden (Powered by CubeCart)
Kaleidoscope Free Pattern that uses "stripey" fabric
Freemotion by the River: Lil' Twister Pillow
034. Estrellas Escher by Artepatchwork, via Flickr 20 blocks each with 5 diamonds. The blocks are rotated 90 degrees to make the stars.
Sew Kind Of Wonderful: Finished Sharon's Quilt!
Modern Trees Quilt A Long (Note these blocks could be paper pieced.)
link to tutorial