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I'm not sure what you're looking form, but it seems like you are trying to allow your users to pick a color in a radio button, if so, then I think this will not be possible since the Form Builder will not allow you to add this HTML code, for example, I assume that you are trying to add a field similar to the one shown in this link: http://www.w3schools.com/html/tryit.asp?filename=tryhtml_input_color
But if you're looking for something else, please do let us know and we will be glad to help you.