heres a neat trico fly 
[video]http://www.wonderhowto.com/how-to-tie-traffic-jam-trico-cluster-for-flyfishing-373079/[/video]
Cool pattern but a thing I have been doing for eons is threading two or three Tricos on my tippet above the one that is actually tied on.
It’s a bit easier to do!
Cool pattern! I have just the place that pattern should work. Thanks Normand for posting the link.