Sound Effect Advice? (Skies Clouds Action)

We spent a lot of time working on the skies and lighting effect on these two pages. I think over all they worked out very well.

The Sound effects were a bit harder to incorperate into the frames. We tried to fade them out and use similar colors so they wouldn’t detract from the pictures.

Did it work?

Has anyone out there found a good resource for making up sound effects or how to use them more effectively?