webform - adding a pull down menu with color squares

Hello,

I am wanting to create a webform in Drupal 7 like the one here:

https://web.mit.edu/comp-med/restrict/anr/rodent-cage-card-order-form.html

I have been searching for how to resources on this, but have only come up with basic form stuff. Can anyone point me in the right direction?

Thank you,
Elaine