I don't see one of these yet, so here's the question for the proposals for the October 2015 Community Challenge!
It's time to choose a community-challenge for October 2015.
- Post your challenge as an answer to this question. Feel free to resubmit non-winning ideas from previous months.
- Vote for those answers which interest you.
- At the end-of-day on Wednesday, September 30th, the top-voted post will become the next challenge.
Once the challenge topic is decided, post your solution as a question on the main site and tag it with community-challenge. The challenge runs throughout October (but nothing stops you from posting an entry later on).