I love Hang Loose, it's really pretty, nice texture too.from In the Groove collection, I use the lavender side of Hang Loose as a highlighter quite often. It's really pretty. I agree with you though, that a BP or MSF would be great. Hang Loose is probably still available from CCO or ACW.
I've also used Frozen White pigment, digit eyeshadow, etc. on those days that I want a blue or purple sheen.