After Blake's CodePen talk about using CodePen just to have fun I made three pens in one day! It ended up basically being Pixel Art Saturday, All my pens have to do with pixel art as it's my favorite.
The first pen I made was this little Sonic Pixel Art guy. I sort of want to make him run around but this alone took me 1-2 hours to just do this one sprite. To make it run I'm looking at maybe 8 hours or so. I might do it, but not the point of a fun CodePen Saturday.
Then I made a 16x16 pixel random art with a Sass loop to randomize the colors. I was inspired by this picked pen which is a 10x10 random CSS pixel art block, you will see how similar it is.
CodePen is a great place to learn, get inspired, show off your work, but most importantly to me it's a great place to have fun. Go out and do something you've never done before just for fun on CodePen.