Maybe something even weaker than the Misfit line. Maybe a urethane pearl. I haven't been throwing them long, nor have I thrown most of the balls in the line, but that's what I can see missing. Oh, and a ball similar to the Taboo Spare.
As for the Misfit Pearl's color, it looks awesome up close. Pictures and video don't really do it justice. It isn't a big bright solid yellow. It's got some smoke-like swirls in it and it just seems to shine/glow. Yellow's one of my least favorite colors, but I love it.
Next ball up for me is likely the Too Reckless.