Woohoo! Thanks everyone for the encouragement. I ended up googling some quilting ideas, and found one I loved. So here it is! Quilting done, and I added a red piping to frame it a bit, because it was feeling a bit lost in the background. So glad I didn't let this one go back into the UFO pile! This photo isn't great for showing the quilting, since it's getting dark and I had to use flash on it. Second photo is a better closeup of the quilting.
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And a closeup of some of the quilting. I wanted the design to pop, so I quilted the background densely and left the red areas and 3D pieces unquilted (just outlined them).
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