I've had a few people write in asking where you can get inexpensive personalized banners. One of the best places to get banners featuring themes is Oriental Trading. They have several of the common themes such as Luau and Farm!
Lots of common themes are included such as space, pirate, construction, etc. There are even plain banners and more adult themes like Casino, Classroom, etc. Most banners are 50 inches X 20 inches and are $12.99! A great find!