Lens Flare Script?

How would I go about making a lens flare script?

well, at blender.org, there is a whole page on using halos to make lens flares. Check out the techniques there and try to make a good flare. Then try to retrace your steps using only python.

There’s an idea at how you might start.

http://wiki.blender.org/index.php/Doc:Manual/Materials/Halos

Sadly I can only use multitexture.