One of the great features of this site is the variety of answers to a question. All of which are correct when it pertains to favorite patterns.
Clouser Minnow. These are tied on size 1 plastic worm hooks. Scale them down or up as you need. If you wish to go small, consider a softer material such as fox fur. Check out Bob Clouser's "Foxy Minnow" series.
The Clouser Minnows in this box are all tied with either fox or coyote fur, bead chain eyes and Polar Flash. Not specifically a trout pattern, but they would work well for trout. I use these for many species.
The other side are bead head Woolly Buggers in 2 of my favorite colors.
These are not my pictures. I got them from the WWW. I pirated these from a fellow who I've purchased similar flies from. However, this style of pattern would work well on trout, especially big ones!
Some of these were purchased, some I tied. I primarily use them for bass, but again they'll work for trout!
Another Clouser style. This is my favorite "leech". Nothing but ostrich herl, tied very full & some flash added. I like flashabou in copper, bronze, gold or black or a combination of these.
Any type of "Zonker". This one is a bit more elaborate than a basic Zonker, but again trout will eat them!