I was thinking about the Aegis and the thought of wouldn't it be cool if magi could add spells to the Aegis so that during the Aegis duration said spells function all over of the Aegis.
One of the things I think would be cool is that it would be part of the Aegis' spell breakthrough ignoring being under a high level magical effect and so it wouldn't cause higher chances of Warping.
The interesting nature of this is that it would make the homes of Hermetic magi a much more fantastical and magical place to live.
I don't know how such a thing would be mechanically done, but I could see it being organized as if the Aegis was a magic item and the various spells weaved into it were powers added to an item.
Casting the Aegis would probably become a little more complicated each year, with man some additional rolls needed in order to make the various effects activate or exist, though I could see boost to rolls based on Aegis magnitude.
An example I had immediately thought of would be a Creo Aurum power that gave the area within the aegis the feel of a constant breeze.
I just had this thought and was interested in hearing what others thought of the concept.
Later
PS. All one needs to do is discover the Perpetual duration from I forgot which book (It might be either Rival Magics or Ancient Magics) and make a breakthrough allowing an Aegis to exist forever, now we can have our highly ancient and mystically potent permanent sites that never loose their defenses.