HexGIMP is a GIMP tool by Isomage that will help You make pretty maps.
I have used it to replace the abstact map in my Trading on PYLKAH adventure. This map might be more fun for the players, since they now have the option of taking alternative routes (which their guides will not recommend).
I thought I should try a variation on the big hex style. This time for an important star system in the Spinward Marches.
All planets (except Cipango) was made with GIMP plug-ins. The Cipango ring system was made with the planet rings GIMP plug-in. The planet Cipango was made from an old texture that I have used for other maps of Cipango.
The distances for the planets from their “sun” Cipango-Taiyoo is calculated using a modified Titius-Bode law. Using the formula below for the Cipango system:
For our solar system the formula is:
Where a is the distance in AU, and m is the orbit number. (Where m is 1 for Earth.) The modification of the Titius-Bode law was needed to fit two planet orbits into the habitable zone. This gives the Cipango system a total of 3 garden worlds.
With the suggestion for a new hex style, I need a way to produce images of gas giants. I can do this (for free) with the gas giant plugin for GIMP. 
Traveller blog posts