Might this..
have made these?
And, if so, can anyone tell me what kind of bee she is? Not the best photos - I'm still getting used to the macro on the new camera, but I hope good enough for an ID. The shiny thing is a penny, if it doesn't come out too well on the screen. There were three holes and I think I saw her crawl out of one of them. But I was trying hard not to step on them - and her - at the time