Implementing a system where people would use the best possible titles and images may be difficult (although we could come up with a system to advise this for best outcomes). Certainly willing to hear further thoughts about this!
By the way, the themed days do help with this to a certain degree, but its primary limitation (ironically) is the fact that I allow the freedom of all topics on all days o the week, haha.
And yes, it's a great point that we're just not up for replying to certain things every day. Someone below suggested a tagging system. I think I might be able to work with that in some capacity. Will think about this.