Here's some jazzier options that also work well for rock progressions, as well as the blues. It's all kind of the same tonality, or type of sound, that rock and blues progressions are striving for except in a rock context, you might not use so many bluesy notes or ideas.
This is called a Mixolydian scale, which is derived by starting on the fifth tone from the Major (do-re-mi-fa-so-la-ti-do) scale. Over A7, use A Mixolydian.....D7 uses D Mixolydian.
Only one note changes between these two scale, C# becomes C. When you make the decision to change a scale, the note(s) that changes should almost always be targeted, at the time of the change. Practice making lines that change from the note C# in AMixo to C in D Mixo.