This design is from a series used for postcards, A4 prints, bags, tshirts etc https://davidmeehanart.blogspot.com/p/y.html David Meehan Art = Good art at reasonable price
One thing I love about natural objects is how they often remind me of handmade objects. Like these acorns--the caps look just knit caps. So I scanned in a handful and used them as the basis for this sketch.