It's very tiny. Why not some background image, perhaps with the kana larger and in front?
Working on a new one right now
For when you absolutely, positively know for certain no-one else is ever going to look at your desktop background... or at least won't know kana or be bothered to learn what those two characters are and mean, in the first two cases.
It would be awkward when your friend visits you and then he know what it is. lol