Hmm, it looks like a lot of online dealers use the names interchangeably, but from what I can gather, Ice Blue Firemist is maybe a little darker blue than Frost Blue Metallic. I've got my S2 Studio in Frost Blue Metallic sitting here next to me, and I would say it's best described as a metallic baby blue. I like it a lot on the guitar, it has the 50's pastel kinda thing going on, which matches the vibe of the guitar. The Ice Blue might be a better choice for someone who wants a more saturated blue color, and/or finds baby blue unappealing. Although, again, may want to look at the actual guitar you'd be getting, because dealers appear to be swapping the names sometimes.