To get to the point, I have intended each time I find my self in utter darkness trying to tie on a fly or rebuild a leader or tie on a dropper, to pre-tie up some rigs that I can tie in and cut loose if needed. My vision is faltering and there is nothing worse than standing in the midst of large, rising trout knowing they could turn off any time and I'm fussing with tippets and flies.
This morning I tied up a dozen Rusty Spiders on #14 Daiichi 1530's (a heavier, shorter and much more robust hook). These are not pretty, so don't judge the tying skills please, I just never got a "pretty" fly out of these materials today, but I will tie a bunch of these to a lengths of tippet with droppers attached and hopefully I'll be ready the next time I'm waist deep in total darkness.
Daiichi #14 1530, Rusty Orange 8/0 Uni-thread, Partridge hackle, gold wire, copper Gutterman rayon thread length for the body.

Rusty Spider Dry

Rusty Spider Wet

I hope to get to try these again soon. A classic P&O will work perfect for this situation, but I wanted something more robust. Losing that gorgeous brown as the hook opened has haunted me all week.
