I like it but I personally don't think that it represents M very well. The curving lines remind me of Porsche instead. The colors are right on but the M moniker has always been represented by those colors in a straight slanted line side by side. One recommendation would be an all white background with the M stripes going across the bottom corner.
Basically what I'm trying to say is most people won't think M when they see the case but I really like your creativity.