Here is a link to a lesson I did on Major Triad shapes. These are not the great big shapes that you were looking for, but they do give you a way to play these chords in a much easier way. Take a look at this whole tutorial as this can shine a light on how to play some of these shapes that will be fairly rewarding quickly.

Here is the one on A major shapes. Let me know what you think!
http://guitartricks.com/lesson.php?input=12503&c_id=13&ch_id=78&s_id=646