Hello!
(All maps are done in Photoshop CS3)
The map in image 8 was made as follows:
Just a sand texture as background (I think I found it in the RPTools's community gallery)
The rock texture (also from RPTools) was just cut into shapes with the eraser tool with low hardness so the edges are smooth, then the layer was given a drop shadow and bevel effect to simulate their height and 3D-ness
The dunes were a little bit more complicated. This YT tutorial shows the general process:
http://www.youtube.com/watch?v=Lqu4JVJWoYw
The resulting dunes were then made 25% transparent and cut to the required field sizes, again with the eraser tool.
Then, I put the little white triangles on each dune square to show difficult terrain.
The rocky wasteland was obviously done as above but I also put some small rocks here and there.
The Kank is just a top photo from a real bug, it was mirrored and some leg angles changed for the second creature. The two Kanks are a seperate Maptools object.
I can give you both maps as PSD or PNG files if you want

Just PN me and I will upload them and send you the link.
Edit: I just noticed that the kank ambush is outdated, I took another look at the Bloodsand Arena adventure and saw that no wagon is mentioned, the text just says that the Kanks carry Kaldras' wares. So I just used the two Kanks without the wagon.