So can he use whatever kind of element he wishes for channeling so long as it ties to summer (ie. summer fire, spirit, earth, etc.)?  Does this apply to ritual as well?  If that is the case, then my player is getting a broad range of effects he can garner by tying summer to his ritual magic.  For example, last game he used his seelie ritual magic to try an find the life force a specific person.

My problem is that it seems like a very broad purview for what is normally (for other sponsored magic) a narrow, yet potent, band.

To help me understand better, could you give me a plausible list spells and effects that could you would use with seelie magic.  Preferably as you would in game, so I can relate things to actual play.