Ok, so, when Danny removed custom profiles (which was basically a bug), there was a massive uproar!
So, now there is a new, much more controlled, way of having your own custom profile!
Way Number 1
Inside your biographyplace the [ style ] tags. Inside these, place your custom CSS and it will take effect on your profile - don't worry, they won't see the code.
Way Number 2
Plant the [ style ] tags* in a blog title. Place your custom CSS within these and it will take effect on your profile! Don't worry - they won't be able to see the code.
* For more information on how to use the [ style ] tags, visit my previous blog.