TuniLame

You will be able to configure the color, size, link and link’s target of each button and even add a defaut button for many posts. 
To use it, just take a look on the plugin’s configuration page which contains all the informations and settings for the default button. 
Add the button by using <code>[button color= size= link= target=]text that will be shown as button's value[/button]</code>
Attributes that can be used: 
* color: There is 7 different colors: pink, magenta, green, red, orange, blue and yellow 
* size: There is 4 different sizes: small, medium, large and super 
* link: The link of the button. Example: Your site’s URL http://mysite.com 
* target: The link’s targeted window, can be: blank, new, parent, self or top 
Exemple: <code>[button color=blue size=super link=http://twitter.com/tunilame]Follow me![/button]</code>
Simply add <code>[button]</code> in you posts when you want to use the defaut settings.

CSS3 Buttons

Add coloured CSS3 buttons on your posts using simply a shortcode.

svegliadesign

The SvegliaT Buttons is a simple plugin to put in CSS3 Buttons inside your blog with shortcode.
Add a shortcode in your wordpress to visualize nice and colored buttons, you can choose following colors: orange, red, pink, black, gray, yellow, green, purple and blu. For any color you can create a small or big button.
Just add the following line inside your blogpost:
<pre><code>[button-orange text="Download" title="Download plugin" url="http://www.svegliatemplate.com/"] 
</code></pre>
also, you can use the button in the text editor or to use button generator in admin page.
The color will be set in hex codes like:
<ul>
<li>button-orange</li>
<li>button-blu</li>
<li>button-gray</li>
<li>button-yellow</li>
<li>button-black</li>
<li>button-pink</li>
<li>button-red</li>
<li>button-green</li>
<li>button-purple</li>
</ul>
For a big buttons:
<ul>
<li>bigbutton-orange</li>
<li>bigbutton-blu</li>
<li>bigbutton-gray</li>
<li>bigbutton-yellow</li>
<li>bigbutton-black</li>
<li>bigbutton-pink</li>
<li>bigbutton-red</li>
<li>bigbutton-green</li>
<li>bigbutton-purple</li>
</ul>
For more information please check out the plugin home page:
<a href="http://www.svegliatemplate.com/wordpress-buttons-svegliat-buttons/" rel="nofollow ugc">See Demo</a>

SvegliaT Buttons

The SvegliaT Buttons is a simple plugin to put in CSS3 Buttons inside your blog with shortcode.

CSS3 Buttons vs SvegliaT Buttons