It's amazing how two vivid patterns together can still look so calm. The wood tones and light filtering through the sheer white curtains probably help.
The ruffled edges on the pillows combined with the tailored headboards and the white night table is just right. I want to know more about what's on the ceiling. Also, I've searched far and wide for similar pillowcases, but to no avail. Do you know of any?
This rug has a similar blue to white ratio, but in a less traditional pattern:
(Coqo Rug from Anthropologie)
And this wallpaper is equally lovely: