I use lots of cardboard boxes for shipping, and I get them free at different stores (Wal-mart is a good place early in the morning).  Most have unsightly printing on them. I turn them into fresh, new looking boxes by turning them inside out. Look at the box and you will see a side seam that is usually glued. Open this seam, turn the box around to the inside, and tape the side up. You have a box with no printing at all. Saves lots of money on shipping boxes, and gives your Ebay item a neat look. Just don't ever turn a USPS box inside out, that is against the law....FEDERAL law.