Yes there is. 🙂 Learning how to target your site’s CSS will help you make certain design and layout changes. Here are some very helpful posts that will help you customize your site with CSS:
https://dailypost.wordpress.com/2013/07/25/css-selectors/
http://dailypost.wordpress.com/2013/06/21/css-intro/
http://dailypost.wordpress.com/2013/08/29/css-matched-rule-pane/
http://en.support.wordpress.com/custom-design/how-to-find-your-themes-css/
If CSS is new to you, here are some resources for learning more about it:
Here’s what the single post navigation looks like in the Firebug browser inspector:

You can adjust various qualities by using CSS. Have a look at the guides I provided above and see if you can start making some of the tweaks in your Custom CSS.
To get you started, something like this would change the main background colour to purple, the font colour to grey, and the font itself to Source Sans Pro.
.site-main .post-navigation .nav-previous a, .site-main .post-navigation .nav-next a {
background: #bb00bb;
color: #333333;
font-family: "Source Sans Pro", Helvetica, sans-serif;
}
See if you can figure out the rest and let me know if you get stuck with something specific.
Great thanks. reading through your links now.