How to add a css class to custom field value?

It’s very similar to how you set / access theme options:

http://codex.wordpress.org/Function_Reference/update_user_option

setting:

update_user_option( $user_id, $option_name, $newvalue, $global ) <- taken from wordpress codex.

and getting :

http://codex.wordpress.org/Function_Reference/get_user_option

get_user_option('color_option', $userID);

To get your specific request fulfilled, you would need to find the user_option(s) and then append to the list via a plugin or theme customization

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