Mixed source space

Code to generate source spaces with cortical surfaces and sub-cortical volumes.
>
> could be the surface. I'm plotting one dot on each of its vertices. I
> could try something more similar to what pysurfer does, (or use pysurfer).
>
yes. Please use a surface as in

http://martinos.org/mne/dev/auto_examples/inverse/plot_dipole_fit_result.html#example-inverse-plot-dipole-fit-result-py