Upholstering Instructions at Better Homes and Gardens. In a nutshell: Strip the chair of its original fabric and use the pieces as pattern. Then pin the pieces wrong sides out onto the chair. Remove pinned cover and sew it together, with welting reinforcing the seams. Put sewn cover back on the chair. It should fit like a glove!
The most simple things really are the most genius. In this case, Halsey took one of those hole-y bins, ran a couple of 1/4" dowel lengths through it, threaded said dowels through the holes in her ribbon spools and then threaded the ribbon through the adjacent holes. Her total cost for the project? $3.12. Genius.
I would choose different paper, but what a cool and cheap idea... brilliant! Wall Hangings DIY: Cover boxes with decorative paper and mount them on the wall like this blogger for simple decorative art.