Ok guys, i have this question for all you guys who want to do something innovative

I am in a office which has around 250-300 computers, each of which has a private IP, ofcourse. The problem is that recently they have installed "Websense" on the network, & no one can access any inappropriate site, even some networking sites. I used to sit & read some networking articles on some good sites like
www.firewall.cx, but those sites also have unfortunately been blocked.
The workstations like mine are devoid of any rights ( we are not even allowed to change the wall paper for the computer).
In the above circumstances, is there anyway any of you security geeks here can suggest to get around this?