Icon Cache Rebuilder has been created by TWCF Member Lee Whittington for The Windows Club, on a request from TWCF member Bamajon197, and has been tested on Windows 7, but may work on Windows 8.1/8 ...

In Windows 11/10, by using the Registry and modifying values like BorderWidth, PaddedBorderWidth, IconSpacing, etc. you can customize Desktop Window Metrics.