I was thinking about pets and the relationship between their power levels and how many you have. Obviously the more you can get, the less powerful they become, else you get OP with your own little team.
I think a temporary pet summoning build would be pretty awesome. With a long recharge time, you can summon either a very strong pet for a short period of time, one or two medium power pets for a medium amount of time, or a gang of weaker pets for a longer period of time. I would imagine a build like this would necessitate a few things; non pet powers would get a little boost in normal power to make up for the majority of the time not having a pet(s), probably a defensive power set as your secondary power.
There are other games, like WoW, that allow characters that would normally have a pet to 'sacrifice' their pet for more power. I think it is the Hunter class where if you are a MM you get 17% increased damage or something like that for sacrificing your pet.
I think it would be fun to try this out a year or two after launch.
Compulsively clicking the refresh button until the next update.