This might seem a bit scary and off the beaten path, but a precocious young designer centered in Brooklyn has developed an easily installable stick-on set of actual wooden keys designed for your computer keyboard (Mac) as an alternative to the smooth plastic norm.  What he has set out to do is to offer a personalized touchable surface since every laser cut slab is individually unique.  Engrain Tactile Keys ($TBA ~$95-$115 projected) is currently in its Kickstarter stage, and  I hope to see these pop up sometime soon.  Check out the video.  The pictures do not do justice to the final product.