Pheasant Tail Nymph is a very simple pattern.  I like the pheasant tail nymph in small sizes, especially 16 and 18.  Works great on spring creeks

 
Good reference book
 on how to fish a nymph
 and fits in you vest.

Below are the materials needed to tie the pheasant tail nymph.  All of them can be purchased directly from Orvis

Orvis Hooks

Peacock Herl & Sword

Copper Wire

Pheasant Tail