Magic acorns

I've just peeped a bonkerstastic must-have item over at HanPicked. Source HP has nowt idea what these (orna-mental?) knitted acorns are 'for'. Neither do I. Who gives. One looks like it's been dragged out of a Romanian orphanage blaze (second from left). They all look like prominent players in a child's nightmare. Regardless of their uselessness, props out to designer Sarah Benning.