Yeah, I believe I have 3 or 4 Hypo Pewters this year. Problem is, that they pretty much look like regular Charcoal Ghosts unless you flip them over to look at the belly.
I'm in Tampa this weeked, so I don't have my photo library available here. I believe I took some photos of some of them during the egg hatching season, but I would have to search for them. We're doing Tinley Park next weekend, so this upcoming week is likely going to be pretty crazy (putting it mildly!).
Besides, I suspect they really won't look like much until they reach adulthood anyway. And even then, maybe not worth the effort. I'm really curious to see if xanthism shows up in this line.