I don't have any new ones at the moment. Being in the midst of a manuscript and the ongoing Canvas to Keynote exodus makes additions unlikely. But it's bad that Maxwell is not represented, and I think Mae Jemison deserves a Valentine.
Here's a list of Valentines posts to get you caught up.
My colleague, Dan Burns, recommends printing them out 4 or 9 to a sheet, cutting them out and giving one to each student. They go over better than you'd think!