Looks really great Matt, each one of them 
I don't know if you know the following, but I'm going to mention it anyways.
After you create that planet-like landscape, you convert it to a pattern.
This is the way to do it:
a) select the whole image (CTRL+A or Select/All) or only select a small area using the rectangular marquee tool
b) go to image/define pattern... and give the pattern a name
c) click ok
Now you can for example type a large bold text using the type tool.
Then...
a) Add a Pattern Overlay layer style and select your new pattern
b) Add a Texture layer style and select your new pattern.
c) Use the the Depth slider to create more or less depth.
Voila, you just created a 3D texture 
Make sure that the Scale option in both layer styles contains the same value.