Perhaps I am a wet blanket or a scrooge or boring but I find the idea that there is a page dedicated to decorating your coworkers office strangely depressing. It might be fun for people who don't have lives or social interactions outside of work.
The article I stumbled upon on wikiHow (irritatingly labeled "the How-To Manual That You Can Edit) describes carefully outlines the steps necessary for curing a case of the Mondays.
The first step is "to find the office or cubicle of the person you intend to throw a party for." The next step is to "identify a good way to decorate it." I think that should probably suffice for anyone who plans to do such a thing, but in the spirit of Jean Teasdale, it continues. It suggests prominently placing a sign "so they know you really want to tell them something." How about a colourful sign made by sponge painting construction paper that reads "You're Fired and I really wanted to tell you!"?
It then suggests wrapping all the objects in there desk with wrapping paper and filling it with something fun, thus preventing them from getting straight back to work.
Instead, they have to waste time, climbing over balloons, and unwrapping individually wrapped office supplies.
"Oh and you even wrapped my pens and pencils. How thoughtful."
The last suggestion is to take pictures "so that you can remember the fun you and your coworkers had for years to come."
I think that if you had to take the step to find your coworkers cubicle or office, you probably don't have any cause to commemorate this event further than you already have.
The final tip:
"Only use certain party items for people who will like them. Otherwise they don't add to the fun."