haha wullie i dont think i have a remedy for that one yet
I had an invasion of ants in the house a while back they were running in rows on the walls and the floors looked like they were alive with them, it was during a heat wave though so they were looking for some shelter from the sun i suppose, gave me the hibbie gibbies really, took me an entire day to spray, suck and sweep them out
in that case lavender would not do the trick i needed a pesticide and all i had on hand was doom!!