Do you have one of these chairs?

I have one. I use the chair in the craft room. It's obviously not a 'pretty' chair, but it serves its purpose. Well, I happened to come across a particular blog called
Craft Rookie and to my surprise, the blogger had posted a tutorial on how to turn an ordinary black computer chair into a super cute chair.... Check out her tutorial on how she did her chair
here Here is my new chair!

(You can click on the link above to see her tutorial which is very detailed. I am going to give you the shorter version of the tutorial, though)
Here is what you need:
Some cute material
An old chair you want to re-cover
A staple-gun
A hammer
An iron/ironing board (if your material is wrinkly)
The walls in my craft room are orange, and I have been wanting to go for a moroccan look in there. I came across this tablecloth on sale at World Market and knew this was the pattern/colors I wanted for that room. I bought the tablecloth knowing I could cut it and use it as fabric to cover my computer chair.

Using a screwdriver, remove the seat and the backrest from the chair. Lay out your fabric around the chair pieces and make sure you have enough to staple the fabric to the back...

I stapled all four corners first. Remember to pull as tight as you can each time you staple so the fabric will look nice and smooth on the front side.

Once you have stapled the fabric around the entire piece, you'll need to use scissors to cut the excess fabric off. You don't want any fabric hanging under your chair.

Your backrest should be in two pieces. Like below. Staple fabric around the front part of the backrest. In the tutorial from Craft Rookie, she covers both front and the back of the backrest. I was only able to cover the front of mine.

And here is that ordinary computer chair all dolled up in the craft room now! The picture doesn't do the fabric/colors justice!

Again,
Craft Rookie has a much more thorough, detailed tutorial on how to do this. I suggest you follow her directions
here if you plan to recover your computer chair. It really was a
super easy, fun craft!