A good while ago, I stumbled across a rather unusual centered decrease in Ravelry, dubbed "bunny-ears decrease". It's a centered decrease that reduces three to two knit stitches. The decrease is not hard to work, is perfectly symmetrical, and not very obvious in the finished piece. So it did become one of the tools in my knitting skillset, and I've put it to good use whenever something unobtrusive was needed as a decrease. Slants as in k2tog or ssk are nice, but only if you want a slanty decrease that is rather more than less visible, especially if you have technical reasons that will stack your decreases, or have them placed in a way that will look weird if they slant.
If that sounds interesting for you, I point you to the site of Naomi Parkhurst, String Geekery. You can find her detailed blog post with photos, drawings, and different instructions on how to work this lovely decrease here.