MyBlog/ MyBlogV2 Pre order question

Hi,

I am interested in the My Blog or My BlogV2 templates.
I have the following questions before I make up my mind:

- the templates come with pre-defined colors (cyan, red, etc..). Is it possible to add or replace a pre defined color (for instance dark blue) ? If yes, how ?
- the template come with 2 pre defined width (800 or 1024). Is it possible to change it into 960 px ? or will this modification mess up the overall module positions ?
- At last, is it possible to add a colored background on both left and right sides from the top to the bottom of the template as you have on youjoomla.com (white background with shadow I guess) ?

Thank you for your feedback.