How to change the colors of easy social and resize the avatar in register page

Hello

I want to change the color of the bars of easy social, to give them a look not so facebook.. and

Secondly i want to be able to disallow the avatars views in the register page for the visitors. This could be helpfull meanwhile you can have more users registered. and when i decide to show this, how can i resize this avatar to look bigger.

I send you an image that maybe could explain better.

Updateme please

Thanks!!