Hey guys!
First time I create a thread in the Classic section, but found this pretty important for people starting a server and wanting to create a quick GMAP.
So first, Go to Graal > Start > Install Packages > Developer Tools & Level Editor > Download.

http://www3.picturepush.com/photo/a/11314951/640/11314951.png (Unsupported image host)

Second, You'd have to open Paint / Gimp or your favorite Graphic editing tool, make an Image of a divisor of 64 (most preferable) and use the same colors for everything. Check attachment for more documentation.

http://www1.picturepush.com/photo/a/11314984/640/11314984.png (Unsupported image host)

Then, you'd have to run the levelgenerator by navigating to your Graal folder (usually C:/users/Username/Graal/) and find the saved image that you just created and set its save location. (Choose the name of the gmap /* I used gmap_ */)

http://www2.picturepush.com/photo/a/11315005/640/11315005.png (Unsupported image host)

Then you're done! Run your map via Level Editor or Gonstruct and it's ready for you to upload it to your server!

http://www4.picturepush.com/photo/a/11315017/640/11315017.png (Unsupported image host)  

I thought this was some crazy new method, but it's just that tool. The title mislead me . Nice guide, anyway.