Another thing to think about is that while Gard's magics are being called "runes"; when I think runes, I'm usually thinking the futhark 'alphabet' that is the same batch o symbols you see on zillions of new age plastic "rune sets". And I don't think that the runes that have been used in the books/stories actually appear there.
All that being said, I'm not saying it's a bad idea to use them, I'm saying this is an excuse to open up the idea of runes/symbols - sponsored or not. There is a Polish & Ukranian tradition of decorating eggs at easter, and a lot of the symbols have symbolic meaning. That could be a type of runes used by a PC or NPC too.
Dian