Example of a right-aligned textbox:
<input type="text" value="hi" style="text-align:right">
White on dark gray readonly:
<input type="text" name="MyField" size="13" readonly="true" style="color:white; background-color:gray" value="<%= MyField %>">
Black on light gray readonly:
<input type="text" name="MyField" size="13" readonly="true" style="background-color:#DDDDDD" value="<%= MyField %>">
And of course you can put a lot of things into the style="..." part separated by semicolons.
CSS Examples
http://www.w3schools.com/css/css_examples.asp