All of this is so important to the image of your business.
If you are running a high end restaurant for example, but print your menu at home on cheap paper, and stick it in a plastic wallet – your clients experience will instantly become confused, and your brand cheapened.
As well as making sure your brand matches you and your business, it also needs to be consistent. Choose a ‘style’ and stick to it, on everything! Facebook graphics, logo, van signage, website, business cards etc – all need to be instantly recognisable as being ‘your brand’. A perfect example of this is the Apple brand. You can spot an Apple product box or device from a mile away – even if you don’t use Apple products yourself. Their brand is so consistent, with the white packaging, tell-tale curves, and of course the extensive use of the Helvetica font – which is always a favourite for designers!