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