The above is a beautiful piece by Yulia Brodskaya (here). She does oh so beautiful quilled paper works, typography, plus much more.
To get you started on doing projects in a similar vein, I have had this tutorial in my queue for a while now: http://www.instructables.com/id/Quilled-Monograms-Cheap-easy-no-special-equipme/
Expect to see from me something along these lines soon!
The full tutorial to make a card of your own is available here: http://www.instructables.com/id/Medieval-Heart-Card/
This is a gift I made for my brother-in-law’s birthday. I didn’t design the original, just followed instructions on this (instructions can be found here), since this was my first foray into papercraft. This really ended up being a labor of love, since it took much longer than I anticipated! This is based on the popular video game, Portal.
Full tutorial can be found here: http://www.instructables.com/id/Woven-together-Valentine/
And a fun drawing representation of it: