The Chubster is a stripped-down version of the original Chubby Chernobyl. It can be fished as-is or dressed up with different colors, hot-spots, or flash underwings.
At the confluence of effectiveness and simplicity is the mighty Hare's Ear. Here is a riff on the old standard, which will liven things up at the vise and on the water.
ELK HAIR CADDIS
If you’re grading on effectiveness, simplicity, and adaptability, the Elk Hair Caddis scores an 11. Tied with just a few materials, it can be dressed up in countless ways to match specific caddis hatches.
Big nymphs have two jobs: entice fish and get the entire rig to the bottom. The Flow Stone does both.
Scuds are an important food source for trout. Whether you want to add a hot spot (as demonstrated here) or try and match what you're finding in your local waters, you'll be able to use this basic pattern as a jumping off point.