Hi CJ,
Do not put them in the sun. You can hasten ripening by putting them in a brown paper bag or keep them in a shady spot indoors. You should find this helpful. There are recipies for green toms at the bottom of the page as well.
http://www.backwoodshome.com/articles/burris41.html
"The green ones
Now, about those other green tomatoes we picked before wrapping the vines. Once again, we sort the tomatoes, and we select the nicest large, full-grown ones to store.
We make sure the tomatoes are dry, then wrap them individually in newspaper. Some people don�t like to use newsprint on food, even though most newspaper ink is now made from soy bean oil. If you don�t like to use newsprint, inexpensive white paper napkins work just as well.
We store the wrapped tomatoes in shallow boxes or trays�no more than two deep�and set the trays in a place that does not freeze or get above about 65� F. Most green tomatoes will ripen in about four to six weeks if held at 55� to 65� with moderate humidity. To hasten ripening, I place a few unwrapped apples here and there among the tomatoes. And I check them periodically, so as to use the ripe tomatoes before they spoil."
Newt