Why do you want to change icon Google +1 ?? I think there is no any other icon that we can use instead of Google +1. What is wrong with this button?
Why would you change it, it's Google's and not yours?lol. Anyway, it's just a way of "liking" the page just like in Facebook. If you like the post, you'll click on the like button. It has similar functionality, the way I understand it.
I want change it to maximize the icon or graphic. I build the static website and it's look like striking with the background color...
Have you change Google + icon? Have you try your idea which you have find about the changes of Google + icon?