I use Hexographer, but this looks interesting. It seems to get a little busy when you have a scale with lots of small hexes, but looks nice with it scaled for larger hexes. I could see using Hexographer for maps of the overall sandbox and using this to make interesting maps focusing on smaller areas.
Yeah absolutely: plus one can create custom tiles. You could theoretically change the hue and saturation of the existing tiles and make your own (which is okay with the developer as long as you don't re-sell them as your own).
...or just run the completed map through an image editor like Photoshop to reduce the overall saturation and brilliance.
I haven't done much playing with the Worldographer beta yet. I'm actually putting stuff together for a new campaign, so I am reluctant to do it on a potentially unstable program. Once I have the basics of my campaign ready, I am going to dive into it.