However, last year i tied up some of these "blue" damsels, its first outing was to Exe Valley fishery, and in the event it proved itself, as numerous fish just launched themselves at it.
Not sure if it was just a one of, or if it would work elsewhere, i tried it out at Hawkridge on the three occasions i have visited, and it seems to work there as well!
So, the tying should you want it is :-
Bead.......3.8mm black tungsten
Tail.........2 strands blue krystal flash then Blue marabou then 1 strand b/k/f
Body.......Blue marabou wound round hook (possibly two lots to fill hook shank )
Rib.........silver holographic ( or blue if you have it )
I now have a bright pink version which does " what it says on the.........."
Never be afraid to experiment, it might just save a blank day.