When attending various trade shows and/or conferences you want to impress (empress/my_mistake:) the contacts you meet. You also want to be eco friendly so that your impact on nature is minimal. Thus this project: I make my business cards from cereal cartons with a black and white laser printer. They come out really neat, colorful and flashy. And they definitely make an impression.
Step 1: Disassemble Cereal Carton
Find side of carton box which was factory glued and carefully detach the folded sheets by hand. Disassemble
Step 2: Design Business Card
There are many programs out there which will enable you to do this. You can even do it in notepad if you're an avid user. Since I'm a Linux guy, I do it in gLabels. After you're done, make a test print on regular paper. Then superimpose the printed business cards on a standard Legal or A4 (if you're in Europe like I) over the carton from cereal and cut out a page for printing your great looking business cards.
Step 3: Print Them Out and Cut'em
You may need to give the piece of carton a slight "push" if you're printer is not too cooperative. Mine just needs a verly light push. Voila, the business cards are ready for cutting. Use scissors or a fancy cutter and your eco friendly low budget cards are ready to bring you success!