Recently, I've noticed, that the makers of Transformice installed a button next to the Help/Rules button near the menu box on your screen. You can see a little TV with arrows in it. Click on this, and it will take you full screen. The only problem I found with this feature is that you cannot chat when you're in full screen mode. I've heard this from many mice, so I know it's not only myself with the issue. I hope this helped x]!
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Actually you can just click the Full Screen button above the Menu button on Transformice. Or when logging in, click the Full Screen button at the bottom.
You can now play on fullscreen by downloading the standalone version or by simply clicking the fullscreen button while playing.
Go to Menu, then click Avatar. Go from there by downloading a picture.
Transformice happened in 2010.
You have to go to options, then click on the screen selection where it says small screen. Click on that, then put big screen. And there.