If you create a workbook that will be opened and used frequently by yourself and - especially - if you design it for sharing with other users, you may want to start it in a compelling, attractive way.
I'm presenting here an example of initializing a worksheet which you might want to appear when the workbook is being started. The workbook is macro-driven, so it must be saved as Macro-Enabled Workbook. This is how the worksheet looks like after loading with a randomly selected photo (this is a screenshot of the left part of my computer screen):