As a CC3 user, one thing that would make the seamless textures usable in that program would be to get a higher res image - 1000 pixels by 1000 pixels. The way CC3 uses bitmap textures for fills and symbols is to have four versions of the same image:
very high: imagename_VH.png 1000 x 1000 pixels
high: imagename_HI.png 400 x 400 pixels
low: imagename_LO.png 100 x 100 pixels
very low: imagename_VL.png 20 x 20 pixels
If you use this naming convention, the program selects the proper one so the map looks the same based on the template size for zooming, printing etc. With a 1000 x 1000, I can resize to the other sizes, usually in Fireworks.
pedrov, I've been working on creating some overland forest fills for CC3 in this thread to share here: [Edit ravells]: thread merged with this one.
If it is possible and you don't mind me doing this, I would love to get a 1000 x 1000 image of your forest tile to include with this.
And looking at the artwork in this thread, I think the next CC3 overland fill set I want to work on will be oceans/lakes. :So I'll be bugging the rest of you soon.