You can address the colleague by name, to do it officially (my name), mentioning the position or preceded by a greeting, an expression of respect and appreciation.
Use warm, sincere wishes. In his congratulatory text avoid using pretentious and standard expressions, phrases (e.g., "long life", "good health" "wish fulfillment", etc.). Get creative and use such a hackneyed phrase.
Be brief. It is not necessary to fill the entire canvas cards, rewriting all the congratulations. Heart phrase of two lines will give your wishes much more accurate and easier to understand than "poem" on the two halves of the card.
Do not decorate a homemade greeting card patterns. This method of registration greetings fit in the case if you sign a postcard to the child, good friend or mother. If you congratulate a colleague, the observance of certain rules required – the handwriting should be smooth and beautiful, color is better to choose classic (black, red, blue), it is possible to dispense with additional decorative elements (squiggles, drawings, stickers, etc.).
Sign the card yourself. Even if your handwriting is not too beautiful, you should not ask someone to do it for you or print the text on the computer – so you are depriving your message of individuality. You can often find postcards, printed in a beautiful font at the bottom with stamped signature by hand – this is an option, but also considered slightly impersonal. In the end, get a postcard with greetings and sign below your name.
Make small greeting. It would be better if a few lines you write yourself, but you can use ready verses, only select the most original and imaginative text. Ensure that the greeting and registration cards matched the theme. Classic and elegant the card will approach the poems in a style, humorous card with funny picture to sign short humorous quatrain.