Theme development

What would be the best way to offer users a variety of themes/layouts for their profile page?

I am modifying the files that the Garland theme creates when you pick custom colors, because I wanted color options it wasn't giving me (mainly a solid black background). Everything is fine except for one place, there seems to be an extra pixel showing. If you look at my page, http://www.captainphatty.com/, I colored the area red so it was easy to see what I was referring to (it will be black when it's done).

I tried to make a custom login box based on the tutorial http://drupal.org/node/92657, but i can't get around a couple of strange problems. Maybe it's because of my modifications of the garland theme, but nearly every primary link leads to a different format of the said box.
Its quite hard to explain, please just see for yourself at http://www.kjs-aktiv.at as you click through the primary links (groups, content...)

I'd be glad if someone could give me a hint!

I have the following site

http://www.donortec.com.au

The site is working ok in firefox but when you use IE, I have theme problems. Which only occur at pages running civicrm.

e.g. http://www.donortec.com.au/user/register

As you can see some of the boxes are stretching the template and causing the information to be further down the page.

Hi,

Hi !
Is it possible to add some delimiters between the tabs ? not the primary links, the tabs.
Thank you.