I altered a plain t-shirt the other week. I used vintage patterned fabrics to make flower shapes. I would normally use bondaweb to stick the shapes to the t-shirt but I didn't have any so I used fabric glue instead. I hand stitched it in place, running stitches around the petals and blanket stitch around the middle of them. I have washed it since and the edges have frayed slightly but I think it has improved it.