Although there are standard colours for every anniversary year up to the 25th, and colours for every five years to the 75th anniversary, there are few conventions for reaching the 100-year milestone. Although purple tends to be the most commonly used colour, the choice is up to you.
Match the Color to the Theme of the Celebration
When deciding what colours to use to mark the 100-year anniversary of your company or organisation, consider matching the colours to the theme of the celebration. If you are having a Hawaii-style cookout to mark the occasion, use bright pastels like pink, orange and yellow. If you are throwing a party with an autumn theme, decorate the site with browns, oranges, yellows and other earthy colours. If you want your celebration to be environmentally friendly, green decor will be appropriate.
Use Logo Colors
In the absence of traditional 100th anniversary colours, a likely alternative can be to use the company's colours. Since the celebration is about the long-standing endurance of the organisation, using its own colours is an appropriate way to mark its success. Consider making shirts for attendees with the logo and its corresponding colour, as that helps spread the colour through the party. You can also make decorations based on the logo or trademark designs.
Use Themed Colors Based on the Type of Organization
The choice of colours for the important occasion can correlate with the type of organisation or business it is for. A strawberry farm may choose red and green themes, while an association that works to promote sustainable fishing practices may want blue, green and other aqua-related colours. The benefit of using colours associated with the business is that casual observers or those who are not familiar with the organisation will quickly understand what the company does, and will be more likely to associate that activity with it in the future --- a useful marketing ploy.
Allow the Members or Employees to Decide
One way of getting all the members or employees involved in the planning of the anniversary celebration is to allow them to choose the colours and the themes. This can help them feel included in the process, as well as generate excitement about the occasion. You can field ideas openly or open it up to a vote. It is easy to send a memo or e-mail to those involved and receive their feedback.