As a blue haired avi myself i go to Runaway hair and .EscalateD. If your looking for a nice dark blue .EscalateD. colors packs are the best. but if you want a lighter brighter blue go with the neons pack. Runaway has a few ice blue and neons but be mindful to try the demos first ive gotten a few without the demos and ended up with the ice blue which i personally dont like. Oh and if you find one you like at .EscalateD. join their group and save a few linden!
.EscalateD.
Runaway Hair