Pick friendly warm congratulations, but neutral. They may be in prose or verse, that will be an indication that you are ready and willing to advance to do something nice for their colleagues.
If your company decided to hold corporate events, you have the opportunity to congratulate my colleagues during a Christmas party. In this case, congratulations, consider whether it would be on the eve of New Year's party in a solemn ceremony or during the New Year's feast. It all depends on the scenario of the New Year.
For this purpose you can use: New Year's verse and song greeting, humorous toasts. You can think and execute their corporate Christmas cards or scrolls.
In the office New Year will help to spice unique gifts. For example, each employee can allocate a certain amount of money that he spent on it to buy one gift. Then add up all the presents in one basket and arrange to come to the celebration lottery. Let it be not an expensive thing, but a surprise that is sure to provide a good mood all the players. For example, a souvenir with symbols of the year, Christmas toys, decorative candles and candle holders, notebooks.
In general, there is a space where it can work your imagination. But to your congratulations were successful, to say they must be sincere, and choose gifts more closely.