Item Builder ⛑

Before

SpinKitFadingCircle(
 color: Colors.white,
 size: 50.0,
);

Now, there is an itemBuilder alternative

SpinKitFadingCircle(
 itemBuilder: (_, int index) {
   return DecoratedBox(
     decoration: BoxDecoration(
       color: index.isEven ? Colors.red : Colors.green,
     ),
   );
 },
);

Which produces