Isleta Duvet cover from Anthropologie I just love because of its neutral palette. And the touches of coral soften it for a girls room perfectly.
Funkleshop. Not sure how much it really is since this shop doesn't offer in USD, but I can stare at it and enjoy. (I originally found this through sfgirlbybay )
John Lewis Mosaic duvet is just perfection. Amongst this simple room, look how it adds just the right bit of color, fun and interest. Love!!!
One of my favorite sources of geometric bedding is Urban Outfitters. They really understand the newest trends and present them in such great colors.
And here is an example on how geometric bedding can be subtle and still make an impact. I think this Magical Thinking Triangle Chain duvet would add just a great touch to my 'Neon' board below.
You can find the original post for this design board along with all the sources here.