In addition to that - in the Netherlands flies like
http://www.pikefly.com/roof/wobbler.htm these are very popular and
succesful for asp (Aspius aspius) fishing. The plastic wobble thingies
(by lack of a better word) at the bottom of the page are available in
the shops and easy to work with.
The text in the page I linked to is in Dutch, but the patterns are
fairly easy. The body material is foam.

--
Herman