Here is a video for a simple nymph pattern for the Grayling. It will also work nicely for trout.

• Hook size: 14 barbless Partridge
• Head: Tungsten bead 2mm
• Silk: as body material
• Body: Nymphit olive
• Thorax: Nymphit red
• Varnished with Deer Creek UV Hard resin and blue light.