from pillar/foo/bar.sls:
{%- for server,ip in salt['publish.publish']('*.bigsky','network.ip_addrs',['eth0']).items() %}
    {{ server }}: {{ ip }}
{%- endfor %}

then, pillar.items from a minion permitted to perform the peer comm (snippet):
        -     return _publish(tgt, fun, arg, expr_form, returner, timeout, 'clean')
        -   File "/usr/lib/python2.6/site-packages/salt/modules/publish.py", line 53, in _publish
        -     log.info('Publishing {0!r} to {master_uri}'.format(fun, **__opts__))
        - KeyError: 'master_uri'