If you are dealing with offline clients, video is invariably going to come up sooner or later. If you are offering video services, BRANDING your client's video will imho, set you apart from your competition and the gazillion videos on Youtube that are poorly executed in terms of branding.
You really want your channel and your video to closely match the online assets of your client. There should be absolutely no doubt to a viewer that the video they are watching belongs to your client.
This video shows a simple but realistic process I use to create a video background for a real client. Ideally, you can use this same process to create a style of your own, the point is to be able to brand your videos and really impress your clients.