I am a little OCD and ADHD when it comes to tying patterns. I much more enjoy free stylin'.
I have found I will notice the colors of the stream bottom and the general overall feel of the color of the waters I fish. Mostly sandy light browns, to dark browns.
I have been using UV flash a lot mixed in through the soft hackles and backs. As well I noticed that many injuries to pin fish and other little critters show up as almost a milky white color where the tissue is kind of dying. So lighter colored patterns work too.
This is one of my own patterns that has been very productive so far. Uses partridge, uv flash, light brown dubbin with uv flash strip down back, gold wrap, partridge hackle tied in the dabbler style with a few strands of uv flash pinned back with hackle. Fish on!!