gistfile1.txt

pillar/venvs/webapps.sls:
venvs:
  webapps:
    venv1:
      python_version: 2.7
    venv2:
      python_version: 3.4

pillar/webapps/init.sls:
webapps:
  items:
    webapp1:
      use_venv: venv1
      (...)
    webapp2:
      use_venv: venv2
      (...)
      
states/venvs/_template.sls
  {{ venv }}_venv:
      (...)

states/venvs/venv1.sls:
  {% set venv = 'venv1' %}
  {% include 'pillar/venvs/_template.sls' %}
  
states/webapps/_templates.sls
  include:
    - venvs.{{ webapp.venv }}
  
  {{ webapp.name }}_blabla:
    file.managed:
      (...)
      
states/webapps/webapp1.sls
{% set webapp = salt.myconfigmodule.config('webapp1') %}
{% include 'states/webapps/_template.sls' %}