These cards are what is known as "Joy Fold" cards, and are something I taught at a class recently. I am not sure where the name comes from, but they do make gorgeoous cards. I find something is required to keep the top layer closed hence the ribbon on the blue card and the flower on the mustard and red one.
The blue card uses "Upsy Daisy" stamp set, Urban Garden DSP, Baja Breeze and Not Quite Navy cardstock as well as Baja Breeze striped grossgrain ribbon.
The Mustard card uses "Eastern Blooms" stamp set, Washington Apple Dsp, More Mustard, Real Red and Very Vanilla cardstock.
The picture below shows how the card opens, I think it's really cute.