I was in a computer store the other day and saw "glow in the dark" keyboard stickers. They were in a few florescent looking colors.
Not cheap, but I was in a mood to spend money so I bought them. I figured an arrow key on the back button, the "Home" button on the home key and then use two generic keys for Menu and search.
Unfortunately, they don't really glow in the dark! They "catch" light off the monitor the keyboard is sitting in front of. Of course, on the tablets on a plane the monitor is shooting the light in the right direction. So if there is any ambient light you can see them. But if you really are in the dark, nada.
Also they look kind of tacky. Part of that is that I'm not artistic and so I didn't get them as lined up as someone crafty would. But even then they look tacky. On top of that I am now afraid to give it a good spray with cleaner. So I think they are coming off but thought I'd take a picture first.
The clear hole stickers I mentioned earlier are not very useful either because you have to "feel" them and if you feel the buttons you've pressed them so too late.
By the way the picture also shows a Skinomi screen protector on. Crystal clear except for one blemish on the far left side off the visible part of the screen
Picture is a little fuzzy but you get the idea.
Of course, I didn't read the FAQ online in the store (smart phone, duh). It clearly says there that they don't really glow. You'd think the packaging would have to reflect that.