@Jedilaw, weekend is defined as the time between Friday evening and perhaps Sunday afternoon, when my wife and three kids leech every possible penny from my credit card and force me to go into stores devoid of computer games or technical accessories.
So, folks... one often overseen factor of planet making (unless you are going for a pelagic world) is the oceans. Therefore I like to spend some time on that for this one. So after touching up the submerged crater impact some it was time for some more sunken features.
Now is a good time to make sure that the black and white of your continents and ice are transferred into some stored selection or alpha-channel. That step will make life easier. Select the alpha and (in my case, invert selection to get the oceans). I then painted huge blobs of pseudo continents semi-randomly over the map. If ocean selected one can be rather sloppy and use huge brushes >300px with perhaps some funky .abr loaded.
Now we got a nice blotchy pattern on a transparent BG. New layer, and do some filter->render->cloud. Blend them together using, perhaps soft light and you eventually get something like this
Fig 4.1 : Ocean colors and variation + huge crater.
Fun, right... next we do something about the land perhaps
Cheers
//Dr. Asz