Dull As Ditch Water

I just learned a new idiom. To help me remember what it means, I have to use it within a self-constructed sentence. I am one of those who have to learn such things explicitly. No, it has nothing to do with being an ESL learner. So, here is the sentence: This blog of mine is as dull as ditchwater. There! That's exactly how I feel. Other blogs that I read are way more interesting than mine. I think I will go and do the dishes now. By the way, instead of ditch water, dish water can also be used. Apparently '(as) dull as dish water' is a modern version.