Green hermit crab??

[BCWolfen]

I just picked up a top off to my cleaner crew by grabbing package 3 from J&L's. Upon getting all the critters into my tank I noticed that 2 of the larger hermit crabs were very distinctly green instead of the usual blue.
I haven't managed to get a pic of them yet, but does anyone know if this is normal? Do the bigger guys often turn more green?

Thanks, will try and get a shot on the weekend.