How can i make a cool business card that still looks professional? Answered

I have a very small cleaning business, it's just me, my clients ask me for business cards quite often but I'm loathe to buy 500 at a time and have a boring old regular type of card.

I know the talent on instructables is endless so is there anyone out there who has a cool idea for a business card that folks will actually want to keep? I'd like colourful, average size and fits in a wallet and preferably made with household stuff. the supplies I'd like to use include acrylic paints, printer paper, glue.  is this possible?

Thanks!