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What about this plugin?

This plugin is a simple plugin wich allow the user to click on the image and zoom it with the PrettyPhoto Javascript (http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/)

If i want to change the theme?

The plugin come with a theme dark; into the prettyPhoto_3.1.4/js folder the launch.js file set the theme as

[…] animation_speed: 'normal', /* fast/slow/normal */ social_tools: false, theme: 'dark_square', [...]

if you want to change a line of the setup change directly; for example, if you want a Facebook theme write this line

theme: 'facebook'

The themes are in prettyPhoto_3.1.4/images/prettyPhoto: you can use a theme you want.

= More info See the screenshot