I found a parametric equation that produced a heart after a quick google search on Valentine's Day. Some of my precalc kids embellished it a bit.
I don't always do a lot with the polar equations, but this year after I discovered that desmos would graph polar equations (and you can add sliders to help you show the different options on the rose and such) I thought it might be fun to take some time and investigate. On Friday I gave them this worksheet that has some really cool graphs on it. I edited it so that the kids couldn't see what the graph would produce. Lots of oohs and aahs were heard!
I was talking with some friends last night... it was nice to have a "3-day" weekend, because it really gave me a 2-day weekend, as opposed to the normal 1-day weekend that we all usually get. It's not just me that dedicates Sundays (or in this week's case, Monday) to school work, right?