What to do when your bored @ work

So, I'm trying to figure out some things to do @ work when your bored and have nothing to do. Some prerequisites for the ideas are that

1) you have no work to do
2) you can do it in an office environment
3) can be done easily in your cubicle

Here are some of the things I do:

1) I blog.
2) Chat online
3) Go onto social media sites
4) read the news
5) think about money making schemes
6) text people

Can anyone give me some more ideas? I can go through the list very quickly.