This is a good, basic tutorial on how to tie a Scud pattern, best used in rivers. A lighter version would be suitable for lakes. In time, you will select color combinations (green, tan, orange) that provide variety. This basic pattern style had potential for Caddis Pupa/Czech Nymph variations, as well.

Grau Scud Nymphe (Angeltechniken)

 A Grey Scud/Nymph Pattern Tutorial at Angeltechniken