I came across these awesome illustrations of the wielder of the Power Cosmic by artist John Gallagher. This image really gives a sense of this power that gives him the ability to travel throughout the Universe at faster-than-light speeds.
These images are from his DeviantArt page. I'm telling you, look through his whole gallery- it is absolutely amazing:
Here is the link to his website:
This illustration shows The Silver Surfer with the even more powerful, nearly immortal being who created him, The Devourer of Worlds, Galactus.