Try any of your standard baitfish patterns, Candlefish, Herring etc. buy some Rainys Popper heads and slide them down infront of your fly, and go to work. Try different retrieves, I some times tell people to find a good beat (Reggae, Waltz, Blues Etc) silvers do alot of following and changing up the retrieve can entice them to strike.

Matt

Gilly, have you tried them behind the boat?

ha, ha, ha... funny you should ask... Gilly, shouldnt you be tipping your guide for putting you onto that a couple weeks ago