Help with stitch choice for a multicolor dragon tail blanket

I'm planning on making a dragon tail blanket for my son (I just finished a mermaid tail for my daughter). I want a stitch that will look like scales, but ideally I'd like it to be mostly black with an edging of blue or green. I like the crocodile stitch look, but I can't figure out how to give each scale an edge of color. I looked at shell stitches too, but would like something with a more 3 dimensional look. Any suggestions for stitches that might achieve the look I'm describing?