Mix two tablespoons of borax with jam, jelly, honey or syrup until there is a paste. Smear some on some paper or a plate and put it where the ants are at. They should flock to it and eat it and take it back to the nest and it will act as a natural ant killer. (Many more wonderful ideas on the web page).
20 Affordable DIY Ideas You Can Do With Pennies. (Ahem, "affordable"... If I had enough pennies for some of these projects, I probably wouldn't be using them for that purpose. But I love the idea of creating something from pennies before they disappear forever.)