Mostly, the theme was dragons. But there was also a terrible, terrible maths pun. 'Mandelblob Set'. It turns out it's really hard to get ink to spread without putting out little tendrils, but when you're trying to paint fractals, the tendrils are what you want.
Next month I probably have to make a thing that isn't a bad pun, but I have An Idea.
Thank you for your support, people. It makes a big difference to me.