Nothing astonishing, nothing technically difficult, nothing beyond just daily use.
Dishclothes and a new kitchen towel.
The ones I knit eons ago (really, it's been at least ten years) have finally worn down to a point that I can't repair them without losing material. They're good for scrubbing the bathroom after cobbling a couple together, and even then they're not long for this world. Eventually, cotton does wear out.
So, here are the new ones. I cannot say how much I love the Lily Sugar'n Cream Solids & Denim cotton yarns. I bought them a few years ago during my dishcloth mania/potholder knitting for the girl's and her beau's kitchen. And since the skeins I bought were the larger ones, I had plenty of leftovers for me.
The cloths become softer with use, they don't get nasty smelly yuck like the nylon/polyester blends and they last, as per my comment above, for eons.