Have you ever come across this problem when you design a logo for a client. They would like to see their logo on a sign, letterhead, mug, or anything that their product will be on, but not sure how you can do that without it looking unprofessional. Well I have come across a company called ZippyPixels who have some great mockups for you design. They offer free design resources, plus paid one's if you want to go that route. I highly recommend these products because they are professionally made. Please check them out, you will not be disappointed.