RE:Prawn and Shrimp imitations??
I know Dec Hogan's made a lot of comments to this effect in recent years (publications). The upshot is that, while you can catch a steelhead on almost any hunk of foam or yarn, the Steelhead gives it his/her all in the fight and you should too -at the vice. He's also a big proponent of creative personal expression and innovation in his tying.
Juro - check out Ed's flies when you get the chance ('specially the Intruder). I hear a lot of the ideas Dec Hogan incorporates in his flies come from Ed! I'm sure you're tyin like crazy right now, and doing the Spey Shuffle in the halls! Only 1 more week and you'll be out here swinging those flies through familiar runs!