One of the great fishing pleasures I have is the endless discoveries when tying flys. I do have standard patterns that I tie but I'm always looking for different, better, or the unusual patterns/material/techniques. I've posted many comments about Davie McPhail and my versions of his flys. His latest post on youtube may be my current favorite. There is so much to learn in this one video.
I also like Davie McPhail, but another series of fly tying videos is the Anglers Art. I have picked up quite a bit watching these. And on YouTube there is also David Cammiss - he does a good job explaining and showing as well.