For some presentation slides, you might need a calendar as a background picture. For example, when you want to present some events or processes. Sure, there are a lot of existing templates that you can use, but it is easy to create your own calendar from scratch.

Changing the color for the table borders is a very simple operation, but Microsoft PowerPoint tables are different from their realization their counterparts in MS Word or MS Excel, where you can change the color for the border in the same place (see How to use paragraph borders and shading in Word and Apply or remove cell borders in Excel).