Social sign-ins via useraccounts package vs overall color theme


How have you guys managed to integrate the social sign-ins like Facebook & Google with your overall color selection for your website/app/mobile app? The blue and red color is so dominant that it kills my color theme. How did you solve it?

This is a screenshot (though not in Meteor, it’s my prototype) and I use the green and orange color for the rest of the app:

I assume I can’t change Facebook’s and Google’s trademark colors in useraccounts or is there any way?

Thank you in advance