Pretty Checkable is a jQuery plugin to create custom checkbox and radio form controls.
A PSD is supplied with the control images and this can be modified or replaced to meet your own design requirements.
The controls can be used in four colours (blue, red, green & yellow) which work well with Twitter Bootstrap.
The configuration options include settings to change the colour, alignment of the label and a custom class name. These can be set in the plugin initialisation or inline with data attributes.