The Best T-Shirt Dress. This pattern is meant for the Dress A Girl Around The World charity. It's a great dress, especially the bit where she uses iron-in interfacing to prevent stretching out the t-shirt all weird while you sew.
I used to do this to my girls' jeans after school let out. Great way to boost the summer wardrobe for next to nothing! Transform an old pair of jeans into adorable summer shorts using bias tape. Instructions on the site.