Gravity Forms doesn’t offer a colorpicker as one of their standard fields. JetSloth released a Gravity Forms Add-On to include a color-picker in your form. It hooks into several Standard Fields like ‘Single Line Text’, ‘Radio Buttons’ and ‘Checkboxes’.
Gravity Forms Color Picker
JetSloth built their Gravity Forms Color Picker add-on off the back of their own popular Image Choices add-on for Gravity Forms. The GF Color Picker add-on works straight out of the box. Simply tick on the ‘use colors’ option when you add any checkbox or radio based field. Gravity Forms Color Picker supports radio fields, checkbox fields and single text line fields.