Sanding off a MacBook's sharp edges
I posted this DIY solution to the Apple Discussions thread here as well with a bit more "story line" as this isn't the place for that.

I created a vinyl wrap for the front edge with some sort of "padding" under just the corner! This is just a prototype and I intend to have my wife use her Cameo to cut a custom design for the vinyl wraps.

 
Here you can see that the vinyl is very thin and adds almost no thickness to the wrist area:

You can see the slight padding I have under the vinyl that just wraps the edge. For this "prototype" I just cut about a 1/4 inch strip of a paper towel. I used a "towel" type paper towel, not that harsh rough stuff. I had Viva brand on hand:

It's not impacting closing the MacBook at all as you can see here:

I've used this for 2 days now working for approx 12 hours each day and I have no more harsh edge lines on my wrist. And she happened to have some scrap black vinyl that happens to match the keyboard perfectly. Looks pretty sweet. Of course I could find a brushed or just aluminum color so they would virtually be unnoticable.

Also, these are completely removeable without leaving any residue. If there is any left, it's very minor and removed by just slight rubbing of the residue. This is the same vinyl used for signs or crafts.

I may have my wife cut these on her Cameo with the theme of the OS releases. Lion (would have been) lion paws, Mavericks will be waves and Yosemite will be silhouettes of El Capitan and maybe Sentinel Rock. But who knows, maybe they will be flames or something else fun. We'll see.