Actually, I did get a chance to do that. You can nab the pack right here in the Mapping Resources section. Here is a link to the thread:
Hope that helps
I've been desperately trying to work on some more mapping but time is currently a commodity that is in short supply. If you have any questions about the brushes, just send me a message and I'll try to help as best I can.
As far as Desert goes, I tried and tried to come up with a meaningful desert texture or pattern and ultimately came up empty. In "Avani" the words and mountains alone differentiate the Desert from the Plain to a degree of success that was passable. I haven't tried anything with jungle just yet, but I suppose a new tree pattern and a few more "tropical" style brushes could probably do the job. If I see anything I'll try to link it for you. I can't think of anything offhand.
Glad you liked the map, thanks for the kind words!
Try this link, it has a lot of hand drawn terrain symbols: