Business Owners set the guidelines for what is or isn't appropriate in the workplace. However, most Christians don't work in churches, Christian schools or bookstores, but rather in secular businesses. Therefore, the "positive and Christ-centered" work environment becomes the responsibility of that individual.
The obvious should be observed: punctuality, appropriate attire, and keeping one's work area well organized are all good places to start. Any decor, if allowed, should not be so overt that employment is jeopardized. If music is permitted, it should not be a distraction to anyone, or a cause of complaints.
"And whatever you do, do it heartily, as to the Lord and not to men.
(Colossians 3:23) The Holman Christian Standard translates it: "Whatever you do, do it enthusiastically."
For the believer, their source of enthusiasm should come from being in alignment and agreement with the Heavenly Father, and from having fellowship with Him. Herein lies the Christian's key to a Christ-centered atmosphere in the workplace. Although tasks may be mundane and repetitive at times, the individual that is influenced by God working in and through them radiates a Christ-like essence.
Though the workplace may not be Christ-centered, Christians in the workforce can create their own Christ environment. Their outward actions reflect internal because they are seated with Christ at the right hand of God. A positive outlook helps everyone, and no one is likely to complain about someone having a good attitude. The believer starts the day in prayer and Bible reading, getting "lined up" and "tuned in" to the Heavenly Father.
Then the challenge, or opportunity, is to take and maintain that oneness with God throughout the day. God already knows all of the problems that could arise, and He has solutions available. He knows that there might be temptations, but again, He has answers and provides a way out of any ungodly enticement. The believer's assignment is to look to Him, bringing His love and His ways to mind, and being aware of His presence every moment.
There is work to do and it's appropriate to focus on the work at hand. Striving for excellence and looking for ways to outdo the previous day's performance should be standard practices. In the course of each day, be innovative, make improvements, believe for solutions to problems. Taking the initiative to make something better is usually welcomed and appreciated.
Galatians 6:10 says, "Therefore, as we have opportunity, let us do good to all, especially to those who are of the household of faith" There are many ways to do good. Learn the names of co-workers. Make a habit of finding little ways to serve others. Ask someone about their day or their weekend and listen attentively. Often just listening and being genuinely interested can initiate the beginning of a relationship. Being a Christian in the workplace does not necessitate evangelism, although opportunities should be taken advantage of.
Since there is work to be done, it would please the employer more if work is the priority rather than conversation. If it seems like someone wants to talk more in depth, make an appointment to meet for lunch or after work. It's better to converse without interruption.
Prayer is indescribably powerful. Pray for opportunities to become more valuable on the job, and for ways to bless and serve fellow workers and customers. Pray for open doors to share God's love and goodness and, ideally, the Gospel of Jesus Christ. Jesus said "The Kingdom of Heaven is within you." The Christ-centered atmosphere, in the workplace or anywhere else, is when the believer has constant awareness of being in the presence of God.