Many of my friends decided to participate in NaNoWriMo, or National Novel Writing Month. I didn't feel like it, so I set myself a similar challenge: Individual Ambigram Design Month. Originally the task was one ambigram every three days (10 total) on one theme, but I realised I could make it tougher and upped it to one every two days. I've just completed the last ambigram with a day to spare.
It was an interesting challenge, often requiring circular/chain ambigrams (or in the case of unicycling, insisting on them), and I learnt a bit about graphics software along the way. I'll have to pick a new topic if I do it again though as I've used most of the main circus apparatus.