Artist Matthew Lineham has two series called New Wave Saints and New Wave Valentines, and each feature Robert.
You can get Saint Robert Smith prints here.
The New Wave Valentines haven't been released yet, but you can see the other designs on his Instagram. Here's what he says about them: "I'm so excited to announce that I'll have New Wave Inspired Valentines on sale very soon! These will include 9 different tear-away designs so that you can share them with your loved ones, friends and coworkers. Each order will include 3 sheets of the 9 new wave designs so you get 27 valentines total. Keep checking back to see the other designs!"
Update (01/20/16): Valentines are now on sale here.