Thanks to Iain Mac Donald for contributing really nice SCT badges: - feel free to either use the code unmodified, or host them on your own server.

1. SCT powered - 124x25 gray

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-powered124x25-gray.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="124px" height="25px" /></a>

2. SCT powered - 80x15 gray

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-built80x15-gray.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="80px" height="15px" /></a>

3. SCT powered - 124x25 blue

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-powered124x25-blue.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="124px" height="25px" /></a>

4. SCT powered - 124x25 green

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-powered124x25-green.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="124px" height="25px" /></a>

5. SCT powered - 124x25 red

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-powered124x25-red.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="124px" height="25px" /></a>

6. SCT powered - 124x25 yellow

<a href="http://sct.sphene.net/"><img 
    src="http://sct.sphene.net/downloads/logos/sct-powered124x25-yellow.png" 
    border="0" alt="Powered by Sphene Community Tools" 
    title="Powered by Sphene Community Tools" width="124px" height="25px" /></a>