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.

Jaimin Suthar

Sliding Enquiry Form is a simple, easy and fully-customizable wordpress plugin used to add popup on fixed position like footer left, footer right, left side or right side with CSS3 effects.
Engage your users with this Sliding Enquiry Form plugin.

Sliding Enquiry Form

Sliding Enquiry Form is a simple and easy wordpress plugin used to add popup on fixed position like bottom, left or right side with CSS3 effects.

CSS3 Buttons vs Sliding Enquiry Form