I am a flyangler and volunteer with Trout Unlimited in Mn and Wis doing habitat restoration and stream surveys. We survey with the help of the DNR to assess the population of trout and other species as related to the health of the watershed.
On one such survey, I was measuring a bucket of trout and snapped a photo of the whole shiny, spotted mess of them before letting them go. I used this photo to design some fabric on Spoonflower, which was printed on silk.
SeeKateSew has a good pattern and instructions for sewing bow ties. Martha Stewart has some great reverse printed instructions for tying them that you can hang on your shirt button while you look in the mirror tying your tie!
So here's a finished tie that will be donated to a TU fundraiser.