Over the past 12 years, some of my fishin' pards and myself have been using and testing blue patterns.
We were told many, many times by other fishermen "THAT FLY WON'T WORK"!
All I can say is try them for yourself and see.
The following are some of the more successful "blue" patterns that we used:
Richards Blue Funk
Blue Ice BLM (A Tim Heng BLM Adaptation)
LoJ’s Blue Funk V1
Blue Magic Dredgemerger V1
Blue Dredgemerger V2
Brahma Blue Soft Hackle V1
LoJ’s Trout Crack (A Hallucinogenic Scud)