Add support with context module

That sounds like a good idea; starting work on implementing it.

Ok, this is now implemented and in the 2.0.x branch.

I think I'll just make using context the way, going forward - for the moment setting a context overrides the older configuration options. What I'll probably do is make the module just provide a way to configure the images themselves, and have Context be the means by which we decide which background image to use.

I'll leave the issue open until I get the above done and everything nice and clean.