Is there a standard way to add fixed-size, arbitrary-design symbols to axes?
 - Their position must be given in data coordinates
 - Their size must be given in physical coordinates (inches/points)
 
They basically need to behave like plot markers, but with the ability to 
specifiy arbitrary designs.
e.g. See http://commons.wikimedia.org/wiki/File:Cloud_cover_3.svg for an 
example symbol.
 
Currently I'm defining my symbols using a sequence of Patch objects, and then 
using PatchCollection (with its offsets and transOffset properties, and its 
set_transform() method) to do the positioning/scaling.
 
Is there a better way?
 
Any suggestions gratefully received!
 
Thanks

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