The magical AfricanPith
I was having a problem where my images in a folder in my RootFiles\Template\Layout\[ProjectName] directory of a feature solution were not being added to my wsp (or .cab) file when I did a build. After much headscratching I have found that the headscratchingly strange solution is that you need to keep the AfricanPith image in there. If I can figure out why this is, from looking at the code, I'll post the code fix.