Things are slow now so why not share fly pics.
I probably fished these flies in different sizes and colors 95% of the time on lakes last year.
Stillwater nymph, Stilly... Rickards pattern to suggest a variety of different bugs.
Flash Bugger (alias Montana leech)
Boobie (add foam eyes and flashy colors and there are 1000 variants)
Leech (again, 1000 variants)
Chrinomid (what fish eat by the hundreds when present)