I should explain beforehand, that I use XeLaTeX, so I have access to all kinds of fonts, and Unicode support.
Now, I'm using the "BALLOT BOX" (U+2610) and "BALLOT BOX WITH CHECK" (U+2611) quite often for attendance protocols.
Now, I'd like to add another character in the likes of that, but with a little "e" or "E" inside the ballot box. This is what I plan to use for "excused". I'd much rather mix the "BALLOT BOX" character with a smaller "E", rather than constructing a new shape as SVG or something, so it'll be no problem when changing to a different font.