Hi Hilary,
This is really nice to go through these links, infact I am also looking to place an image in an infopath Button.
But the case is slightly different, in my case i am using "Web Service Template" rather the "Blank Template".
I have applied the same changes as the posts are saying for both kind of template, but unfortunately the Web Service template is not displaying the image.
So is there any tricky way to populate image on an Infopath button( for Web service Template)