Yes of course all you are doing is referring to the existing path of the images.
BTW I think the URL code I gave may be a bit wrong:
Try this instead:
{{u=URL('static','plugin_layouts',args=('layouts','Optimism'))}}
..., or, try this,
Replace the index function in your 'default.py' controller with this:
def index():
redirect(URL('static','plugin_layouts',args=('layouts','Optimism','index.html'))}}
You may have to play around with it a little.
