Ants, ants, go away, find your lunch some other way...

Does anyone have any ideas about natural ways to get rid of ants? I have heard cinnamon, I've heard cucumber, I've heard Ant and Roach killer.... that one doesn't sound so appealing, but I'm SICK of ANTS! It doesn't seem to matter how clean things are, they will still look for something to eat. Windows open are a requirement, and the ants that are coming in are coming through the screen--yes, they are that small. Soooo, I guess this is a plea for help. If anyone has any ideas, please leave me a comment and let me know. THANK YOU!