An inexpensive way to create a great looking and very unique area rug is to collect carpet samples from flooring shops in your area.
Often times companies throw out discontinued samples which you can pick up for free.
Once you get all the samples home, play with the layout until you find something you like.
When your design is finalized, you can use carpet tape or even duct tape to hold all the carpet tiles together.
Then all you have to do is sit back and enjoy.