The default active cell format in Microsoft Excel isn't all that easy to see, but you can use this easy-to-implement code solution to change that.

You can type codes in VBA Editor to change the cell colors in Excel. Learn how to change the cell background color with VBA Editor in Excel.

To change Gridline color in Excel, use Excel Options, apply a custom-colored border to the cells, or apply a custom line color. Full details here.

Macros in Excel can perform functions like inserting pictures, copying data from one cell to another, etc. In order to write an effective macro to insert images in excel, you will need to use a loop.