How to make maps?

[Agrajag]

For all of you Photoshoppers Ive found a decent way of creating a map.
Create a new file, make it 1000*1000 pixels or so.
Filter>Render>Clouds.
Now in the image settings make the picture file about 16X bigger (4000*4000).
Obviously, you can choose different sizes to your liking, but this specific setting comes out pretty nice.

Now, Filter>Sketch>Reticulation, and choose 0 for Density, 1 for Black and 1-15 for White, depending on how much water you want in the map.
Image>Adjust>Selective Color and make the blacks brown, the neutrals yellow and the whites blue (Or just use the Load option, load the attached file and choose Relative rather than Absolute).

If things don't look smooth enough, you can always Filter>Blur>Blur More.

EDIT: Since I can't attach the correct filetype, after downloading the file, rename it to Map1.asv rather than Map1.txt.