Dull, gray, boring flys are what catch the dumb trout. Ask
DUBBIN.
Personal take is, if you "bore" them into biting then you
gotta be doing something right. Lulling them into a false sense
of confidence. The vast majority of bugs don't have much flash
to them. Why invite the hungry critters??? Be the wee bit of flotsam
and make them curious. Once they realize that a morsel (?), is about to
get away ... CHOMP!!!!!

Just my thoughts ... No proof, No facts, pure conjecture on my part.
hank
PS. Dub-ya, great looking flies...