here is a book I found on different ways to get rid of ants
http://www.amazon.com/exec/obidos/AS...254322-4449408
and here is a homeopathic remedy that contains dried crushed flowers. Its called EcoZone and is almost at the bottom of the page.
http://naturalanimal.com/homegardenpestcontrol.php
I cant tell you if either of these things will help you in any way. I have no such qualms will killing bugs that come into my house and so I Raid the little bastards if they do come in. Maybe that book will have some good tips that may be helpful to you.
Good luck and let us know how the battle turns out.