[Replicant]

You can with javascript/jquery. There is a javascript object on every page called pageData. The pagetemplateid is in that array. You can find the pagetemplate id by right click, view source, find (Ctrl-f) pagetemplateid. So if you do something like this for pagetemplate 93

$(document).ready(function(){if (pageData['pagetemplateid']== '93');
$('body').css('background', 'red');
});

It would set the background css attribute red for the body tag. You can use #your-id or .your-class in place of body and change the css attribute to whatever you want to set.