Thumbnails from mySQL binary data

Greetings, I just started playing with the GD functions. (FUN!!!) And I am looking for advice or scripts on how to turn binary data from my DB into thumbnails. I understand how to make thumbnails from existing images already "sitting in a directory," but how can I get a scaled image to be made directly from the binary data in my DB. Your guidance or advice would be most helpful and TRULY appreciated. As always, my final functions will be posted for all. Thanks in advance my friends!!! - NorthBayShane