The lack of color change... seems to have been caused by my server being reeeeaaallly slowwwwww... I believe I'm the victim of brute force login attempts right now- this is slowing my sites significantly, and apparently the delay extends to the preview. I'm getting crazy 30 second to 1 minute delays, so it seemed as if nothing was happening at all.
The background thing is still an issue. If you check out some other themes (I want to say pretty much any theme).. or even sites like twitter.. you'll notice that they have a buffer graphic between the background and the content. That way, you can have anything as your background, and it won't interfere with the content. I wanted to use this background image:
(you can click the center button to make it a full page preview)
Not a very good blend for any text color.
Example twitter page- crazy background, content buffer:
So, looks like 2/3rds of my issues were on my end. I'm sure you put a lot of time/effort into the theme, and you took the criticism really well. If it's any consolation, I've been up about 20 hours straight now, and dealing with brute force attacks on a dozen or so websites. Looks like you're the victim of a frustrated insomniac! Sorry bout that. I'll see if I can revise the review.