Just out of curiosity, I tried to create a VGA signal with the Xilinx Spartan-3E Starter Kit. It all ended up as a Pong game with some funny behavior. Feel free to download the project files (created with Xilinx ISE WebPack 12.1) or just watch the video. The project runs at 640x480@60Hz. I learned about the VGA signal timing from here and of course by playing around a lot ;o)