Will,
(This time to the list. Apologies to Will who gets this email twice.)
Funny thing you should mention this here. Rogan brought it up in IRC
and a couple of us chimed in that it should work.
You should also be able to embed SVG graphics in your templates as well:
Hi everyone,
I don't really know how to attach this message to the relevant existing
discussion, but I thought it was worth mentioning that you can actually
'embed' an image in your print templates through the 'magic' of base64
encoding.
Basically, you go to a site like this: