Here are some of the variations using down/up strums. You will be able to apply these rhythms to most chord progressions in * time. Play each rhythm pattern four times and end each by a single strum of the A major chord.
Rhythm Pattern
Rhythm Pattern
Rhythm Pattern
Rhythm Pattern
Rhythm Pattern
Rhythm Pattern
Experiment with any other combinations that you can think of. Try one new rhythm pattern each day.
Does your rhythm strumming sound even and pleasant to the ear? Check the following points: