Too much routine breeds banality. You stop seeing things that are interesting because you see them everyday. You stop looking.
It is important to see things in a new light if you are to be an artist. And by artist here I mean artist/designer/illustrator/photographer/creative whatever. You need to be excited about the everyday, because that's our main medium. Our job is to remix what is already known. The best artists don't create mind-blowingly new forms. That's because a good artist understands how to repackage what we already know, and that's what makes us pay attention. (We tend to ignore or be terrified of things that are altogether new).
When you have a regular dayjob, you tend to take the same route, sit in the same spot, and see the same people. You do the same kinds of tasks. Most people cannot avoid this routine to some degree. It is easy to get lost in the routine, to do what you do, use the same tricks, make the same assumptions every day. Even the smallest changes in our daily routine can cause us to see something in a new light. Taking a different route to or from work causes you to see your city differently. You discover a street you never really were conscious of before. It's just a street, but to you it's a new street, and you notice things: the ashtrays on the large stoop, the purple house with the open window, the pig-shaped weathervane. Something that residents of this hypothetical street may not find these things interesting, but you pause to take some photos for your blog. It just may be that someone who knows that street sees your photos and appreciates them. Appreciates said street again because you repackaged its existence for them.
Take a new route. Do something different. Use a different pen. Adjust the height of your task chair. Draw instead of photograph. Journal instead of tweeting in transit. Walk instead of bike. Take the bus instead. Do something different everyday, and think about your world anew, and maybe, just maybe, you'll be onto something big.