Osmia avoseta. Discovered recently in Turkey and Iran, these colorful nests are made out of a layer of colorful flower petals with a layer of mud sandwiched in between another layer of flower petals. It creates the ultimate posh nest for their newborn. Each flower pod holds one bee larva which feasts on the nectar and pollen deposited inside by its mother.
Talk about a pregnancy nesting phase! I hope to be so creative and loving towards my new little one as my nesting instincts usually start to peak around my 3rd trimester ;) That first photo would make a cute nursery print, especially with the story behind it. I keep thinking I'm going to see an Anne Geddes baby pop out of the top of them though.
For more photos and info see the Nat Geo article here.