They look something like this:
The top ones are Facebook, then Twitter, then Google+.
Styling the first two rows of buttons with CSS is simple. They have class="fb-like" and class="twitter-share-button". I can move them around on my page and place them exactly where I want them quite easily.
What does Google have you ask? Nothing. Zip. Zilch. Instead, it has id="___plusone_0" which means that it is somewhat useless as a general CSS selector.
I know this is nit picky on such a small issue, but an oversight like this seems hard to fathom. I've google'd around a bit and it really makes me wonder, how come no other site designers have brought this up?
In the end, I just put my own div around the element, but that seems like such a kludge when the other services seem to do this correctly.
Maybe I'm reading too far into this because it is such a little thing, but it really makes me feel like Google doesn't understand the needs of site developers like the other Social players do.