cant find a colorpicker for my project , how can I customise checkboxes (of a choice-list)

as you see in the title , I search for a tutorial or a courses to how can I integrate a colorpicker in my symfony form (ps: I see that symfony have a bundle named GenemuFormBundle , but when I tried to use it and following all steps , no thing is shown or done .. ) , then , I like to know how can I customise checkboxes in a choice-list (form) symfony , to adapt it with bootstrap ?

thank you in advance.