Yesterday I was watching Nate Berkus on his new TV show and loved his reupholstered dining room chairs. He made them with shower curtain fabric in a cotton/poly blend. I don't have any chairs to cover, but it did remind me that there are many sources for fabric other than yardage from a fabric store.
He also used striped sheets to remodel some shelving. So keep your eyes peeled for sales on shower curtains and sheets in patterns that appeal to you. If you make something cool come back and let us all know.