Third-party ttk themes

So... using Anaconda 2.2.0 / Python 3.4.3 on Linux, and the only ttk 
themes that came with are 'clam', 'alt', 'default' and 'classic'.  I've 
seen reference to other theme names like 'aqua', 'step', 'winnative', 
'vista' and 'xpnative'.  Are these themes - or others like them - 
available somewhere, some sort of theme repository?

Thanks,

Monte




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