Windows 3.0 also includes a built-in setup program for changing hardware around after the fact.
Apparently the MS-DOS command button in the Program Manager doesn't work by default...
Double-clicking on the desktop reveals the task list. If this looks familiar, it definitely should.
Like much of the rest of the OS, the control panel has been redesigned to use larger icons.
Another change from Windows 2 is the presence of built-in themes, as well as a solid color selection in addition to the custom color picker. There are also patterns to choose from as well, so you don't have to have just a solid color.