I would have a carby lunch - typically soup with a decent portion of wholemeal bread, plus Some fruit. Maybe white bread if there is not much time between your lunch time and evening run.
When I get home after work, maybe have a bananna, and get out running. Back home, chicken salad or something along those lines.
When you say "low calorie" what do you mean by that? What are you wanting to get out of your pre-run snack. Do you need the energy (the calories) to fuel the run, or is it just to take away some hunger pangs. Is it that you are more keen on it being low fat, rather than low calorie? I think more info is needed on the purpose of the pre-run snack. Have you been tiring early on your run?