I just spent an hour or so tracking down the tool to store images in
Python source code - img2py.
There was only one reference to it on the Wiki, and that was in some code
at http://wiki.wxpython.org/index.cgi/WorkingWithToolBars
To help others I've added an entry to the FAQ (17) at
http://wiki.wxpython.org/index.cgi/Frequently_20Asked_20Questions
Perhaps someone with more knowledge of it could extend
http://wiki.wxpython.org/index.cgi/WorkingWithImages ?
Hugh