Seelie Magic should also include light effects, biomancy, illusions and transformation. In my opinion (for what its worth...) Sponsored Magic would also include access to some of the 'non-denominational' Thaumaturgy themes as well, covering Crafting, Wards, Divination, etc. What is important to remember with this is that any such spells need to have a Seelie/Summer flavor, if you will. By that I mean that a complex, integrated Ward, complete with landmines, is certainly possible with Seelie Magic. The caveat would be that while the landmines could use a fire-based attack (being Seelie/Summer Magic), they would not be able to use a cold-based attack.
If you aren't sure whether or not a particular type of thing would be available with Seelie Magic, then consider whether it would fit within the theme of Unseelie Magic. There are some areas where both Seelie and Unseelie Magic have influence (divination, crafting, illusions and wards, etc), there are some areas where neither type has influence (diabolism, necromancy), and then there are some areas where the two types have opposing influences. Examples of this would be Seelie Magic's influence with fire/heat, life, light and growth vs. Unseelie Magic's influence over ice/cold, darkness, death and decay.
If there is a type of might which you aren't sure is appropriate, ask whether it would make sense for Unseelie Magic to have it, or have something which is the opposite of it. If thematically you aren't sure its appropriate for Seelie Magic, and it's not appropriate for Unseelie Magic and there is no 'opposite' for it which would be appropriate for Unseelie Magic, then it likely falls into one of the 'neither' categories. If on the other hand it seems to fit both Summer and Winter, then include it. Similarly, if the type does seem to have an opposite which would fit Winter, or if the type has an opposite which seems more in line with Summer, include it.
-Cheers
