If you go to a craft store, get some baggies and pretty ribbon so you can individually package brownies etc.
I think Halloween cupcakes would be perfect this time of year! Cupcakes are always a big hit, frosted brownies, and individually bagged items go fast for the "take it with them corwd" the frosted stuff gets eaten right away.
Here is another tip, it wont help you now but maybe in the future for fund raising, we did a pie bake sale just before Thanksgiving break at the community college, sold whole pies. We ran out SO FAST! We had advertised it well, but let me tell you, people love not having to bake one more thing! Especially at our college where it is mostly working moms & dads going to school. It was so successful the local culinary arts high school is planning to bake the pies and do this every year.