Want to take part in Incowrimo but can't manage a whole letter-a-day to send? Maybe you could compromise and do this challenge instead. It doesn't matter if you can't do it every day. The main thing is to enjoy writing letters/postcards.
28 challenges for this month, one for each day. When writing a letter, please answer the question or use the writing prompt or do the task for that day, or just pick one you fancy doing (or at random).