Here are links to some of the more popular conversion projects that I've done in the past.

Chaos Dreadclaw from a plastic Drop Pod

Flying stand for the Dreadclaw

The infamous Decimator conversion

Multi-use model kits  *Disclaimer* This was way before some official models existed at all!  Given that, the idea of the article still rings true.

Warpsmith Conversion

Magnetized Marks of Chaos