In other words, the heart is here to stay.
You Had Me At Halo by Amanda Ashby
Undercover by Beth Kaphart
Jenna & Jonah's Fauxmance by Emily Franklin and Brendan Halpin
The Sky is Everywhere by Jandy Nelson
In a Heartbeat by Loretta Ellsworth
My Beating Teenage Heart by C.K. Kelly Martin
Mad Love by Suzanne Selfors
The Lipstick Laws by Amy Holder
Dangerous to Know by Katy Moran
But I Love Him by Amanda Grace
Twenty Boy Summer by Sarah Ockler
Recovery Road by Blake Nelson
While some of these I find rather blah (see Fauxmance), there are also some pretty unusual takes on the idea. Like the last two with a girl making a heart with her hands - it's cute but also slightly sad...
But my favourite has to be the very first - You Had Me At Halo. The pun is fantastic and the cover adorable - all round, very cute!