I’ve seen opium poppy pods. dandelions in seed and maple tree seeds (they have those wings), plus the seed packets already mentioned. Not finding the poppy pods design, will continue to look for it. Quite a few folks have dandelions in seed with the fluff blowing (in the U.S., it was a thing to make a wish and blow on the seed head). You could get one of the dandelion designs and make a towel front that’s all the floating seed heads (some other seeds do that as well).
Thank You. I will go searching. This young girl did mention Botanicals so imagine she was thinking along those lines.