you can change the color of the fonts in a particular element by adding this value in the style attribute
for example:
<div style="[b]color: #d38600[/b]">
or
<font style="[b]color: #d38600[/b]">
or
you can use css for modifying your layout:
for example:
<style>
body { [b]color: #d38600[/b] }
</style>
this example will change all the font color in your layout.
or you can change a specific font color using other selector, for example:
<style>
a { [b]color: #d38600[/b] }
p { [b]color: #ff6600[/b] }
</style>
or use same color in two or more elements by adding more selector and other elements have different colors, for example:
<style>
td, div, li { [b]color: #d38600[/b] } }
a { [b]color: #000000[/b] }
p { [b]color: #ffffff[/b] }
</style>
you can learn mo in
www.w3schools.com
--
to add/remove/edit the border of an image, you can use css styles for that. for example:
<style>
img { border: 1px solid #FF0000; }
a img { border: 0px; }
</style>
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you ask a general question. you did not ask how to change a particular element or module so i answer it generally.