I love repurposing and extending the life of just about everything... and with a little girl who grows too quickly, ruffles are just magic. We got some great hand-me-downs that I loved, but were just a bit small - the jeans were highwaters, and the dress was short and tight around the arm holes.
A ruffle of scrap fabric fixed the jeans, and cannibalizing an old blouse of mine for a ruffle and sleeves, we had an entirely new dress. The dress had an underskirt which I sewed a wide ruffle onto, and after widening the arm holes, I sewed on the new sleeves (taken from my blouse, but trimmed down to size and given some fresh elastic).
Next up: to try to convert a too-small long-seeve onesie into a T-shirt for potty-trained, summertime wearing.