I call them eggs. They don't have much in common with any egg of any type, but they remind me of eggs.
I'm exploring paper folding without heading toward origami too much. I also like the way to have to peer into them to see what's inside. Or "concealing and revealing" as my abstraction lecturer put it.
It's oil sketch paper (my new best friend), acrylic paint and black cotton. They are all about 20-25cm squared in size.