Twitter Bootstrap is getting very popular recently. Stefan Petre has developed two really useful plugins for Bootstrap in order to enhance the experience. They are Colorpicker for Bootstrap and Datepicker for Bootstrap.
Colorpicker for Bootstrap can let you add color picker to text field or to any other element. It can be used as a component on Bootstrap. It supports multiple formats: hex, rgb, rgba, hsl, hsla.
Datepicker for Bootstrap can let you add datepicker picker to field or to any other element. It supports formats: dd, d, mm, m, yyyy, yy, with separators: -, /, .