BuddyPress.org

Actually I like the numbers and arrow as they are. You should be able to make all of the visual changes you like by tweaking the CSS. I viewed the source and here are the classes.

page-numbers
page-numbers dots
page-numbers next

So one example for your custom CSS could be

====================
====================

.page-numbers {
font-weight:bold;
font-size: 1.2 em;
}