[Unity5] Custom UI multiple Checkbox with Buttons?

Hey guys, I am trying to develope a multiselectable, dynamically panel.

It should look something like this:

OnClick or selecting those, it should change it's color about 10% darker (so one realizes, it's pressed)

How would you guys do it? At the moment, I'm thinking about having a panel in which I would dynamically append buttons to it. But doing it this way, it would be inefficiently, wouldnt it? Because actually, the 'buttons' should only change their value (isActivate or !isActive), which a checkbox has it's sense for, and in addition, I'd have to render the buttons according to their value by myself. So is there a way to edit the checkboxes (are there even checkboxes in Unity5d actually, lol?)

Kind Regards

PS: Sorry for the wrong Tag, I couldnt chose some like: Unity5d GUI UI Checkboxes or something, hasn't been found