My Heartstrings pattern (here's the pattern step out and video links) is definitely up there as one of my most favourite. Love it.
Sadly, I hadn't played with it for a while - too many patterns, too little time. And, let's face it, I have a really, really short attention span. After seeing some of the gorgeous efforts on Adele Bruno's "It's a String Thing Challenge" back in December, I was re-inspired to use Heartstrings again. And to use red! I am loving red at the moment.