directory structure for images etc. ?

Could we have some definite recommendations about where
images should reside on Xaraya installations ?

Right now, there's :

modules/<module>/xarimages/... for default module images
and
themes/<theme>/images/... for global theme images

I'd like to know if we'll be putting theme-overridden module
images in :

1) themes/<theme>/images/<module>/... like what PN
   used, or

2) themes/<theme>/<module>/xarimages/... like andyv's
  new xarTplGetImage() function currently does, or

3) themes/<theme>/<module>/images/... like andyv's
   but without the leading xar*, to be consistent with
  the fact that none of the directories under themes
  uses the xar* prefix, or

4) some other themes/<theme> arrangement to make
  it easier for template designers to reference images
  in a consistent way, whether they're under modules/
  or themes/, or

5) some separate images/<???>/<???>/ directory
   altogether

Since I'm not a designer, I can't really evaluate the
advantages/disadvantes of each of these schemes,
but I *am* interested in having something definite
decided, so I can point to the right places in DD etc. :)

Mike.