In the spirit of being adventuresome, I didn't even google how to do this. I just dumped a cup of sugar and a half cup of water into a saucepan, let it come to a boil, then added two sliced limes. Very thinly sliced. Well, as thin as I could make them, I should have gotten them a little thinner but my knife needed sharpening and my sharpener wasn't working very well. Sigh.
So if you have a couple of limes hanging out in your house and you don't know what to do with them, try making some lime syrup.
1 cups sugar
1/2 cup water
2 sliced limes, sliced very thinly. (use more if you like)
Combine water and sugar and let it come to a boil and cook it for just a couple of minutes, then add the sliced limes and cook an additional 10 minutes or so, until the slices of lime become translucent. Remove the lime slices, and let the sugar syrup cool for a couple of minutes, then strain it into a jar and keep in the refrigerator and use it in margarita's, or maybe in some whipped cream for flavoring, or anywhere you want a punch of lime flavor. I know I'm going to experiment a little.