This trick will give you a credible alien landscape texture, that can be manipulated into many other textures.
-From the loaders window load a Plasma (this is one of the older pre-2.x GIOs that can be found in the ExtraGIOs drawer on disk 1 - drag it into your Data/GIOs drawer in your Photogenics install and restart Photogenics to enable it).
-Convert this to Greyscale
-Apply Contrast with a setting of circa 130
-Chose Line Art from the Paintmodes window and set it to Greyscale Apply to your picture
-Again from the Paintmodes window chose Gamma, and set this to -160 You will have to apply it several times until it looks like a landscape with water.
Colour
-Clone your texture (R-Amiga C)
-Click on contrast in the Paintmodes window and use it heavily on your picture
-Transport the clone to the Alpha Channel ( Press 3 on the keyboard)
-Tint ( Paintmodes) with a nice light blue, setting Normal
-Apply Negative to the Alpha Channel
-Using Tint again, but this time in the "Tint Highlights" setting, colour the "land" in the colour of your choice. You will notice that you have to apply the colour quite a few times. Don't forget to Fix in between!