Pinwheel Progression

I am pleasantly surprised at how much progress I've made on those Peace pinwheels.

More chain piecing

and my pinwheels are finished!

Now I need help deciding on the background color.  Ignore the layout of the pinwheels.  I just randomly placed them on different fabrics to audition backgrounds.  Several of you recommended gray which is in the above picture.

Above, the blocks are placed on a white background.

I only had a small piece of this blue batik.

Finally, here is a picture with some blocks placed on a gray batik.

I got tired of this experiment after four background fabrics.  What do you think?  Your suggestion doesn't have to be one of the above choices.  Also, regardless of color, do you think I should go with a solid background or a batik background?  I am hoping to decide and buy the background fabric today or tomorrow so that I can work on the background squares Saturday at our guild's Sew Day.

Thanks for your help again!  What would I do without you?  I guess I'd have to make a decision all by myself.  That's no fun.

Have an amazing day!!