One of the problems with contributing to RTDNTOTO is that it's very difficult to determine in advance whether a thought is truly random, let alone whether it's a potential candidate for a new thread. There may be a partial solution out there in the form of this website, http://www.random.org/, which can help you introduce randomness to almost everything.
For example, entering the thread title, Random Thoughts Deserving No Thread Of Their Own 5 (2010), into their random list generator resulted in the following:
There were 10 items in your list. Here they are in random order:
Try it, it can help you waste random amounts of time.