I think runs are wanted by a lot of people. They seem to enhance your playing and they bring life to basic chords. I think it is hard for people to share their runs though. I have asked, on a couple of occasions, for us to have an open share where we can take turns posting runs so we can all benefit from each others runs. Most people will say mess around with the major scale or the blues scale. We appreciate the advice but it doesn't seem specific enough. (lol I'm not trying to be ugly). I've notice that some real simple to explain runs could take for ever to discover. The bad thing is when you hear some one play a run, effortlessly, and you go home to try to figure it out and it just want come. You feel everyone knows this runs but you.
Something that I found out to be real simple is to play the blues scale three keys down from the key you are playing in. So if you play a Eb 7th chord in your left hand you would play the blues scale (fast) in the key of C (C, Bb, G, F#, F, Eb, C -repeat down the keyboard). Finding out what fingers to use to make the pattern sound continuous down the keyboard may be the challange but those are the notes.
If there are any others that could and would like to help us learn more runs we all would be most grateful!