Via Mankiw, here is one Valentine for environmental economists*:
There are 13 more for regular economists here: http://fosslien.com/heart/.
*Of course, this Valentine reopens an old wound for a commoner. To truly be in Mankiw's club you can't be just any economist (or pundit), you must be an elite economist (or pundit). Ordinary economists were forced to join the Facebook version of the club.