The Loynton Guinea is a highly rated lure, but uses natural guinea fowl rather than coloured.
Lures :: Loynton Guineas - Trout and salmon fishing flies online
Maybe worth a try as front hackle on several lure patterns such as the humungous etc.
The blue dyed hackles are often used as a sub for blue jay and tied as a beard on the Invicta, Dunkeld etc.
The main problem with Guinea hackles is that the fibres are to long for winding on trad trout flies. One way round this is to tie in a bunch of fibres so the length is correct and pointing over the eye, rolling them round the shank next to the eye,. Tie the rest of the fly, then pull the fibres back and wrap thread up to them to force them into a backward sweep. Form the head and whip finish.