Re: Green Lantern Object Creation...
I like this approach. In all honesty, you could tack on a "Variable Adder" and "Variable Limiter" onto the base TK to allow you to chnage or alter the effect. GL is famous for creating a giant hand to grab people or (as in KingdomCome) a giant scoop to pull people out of water.
As was mentioned, The driving force behind the GL is the wearer's will over reality. A the base, he can manifest anything he/she can imagine.
Personally, I think I am going to work on the TK approach... Sounds good to me.
In regards to paying END for the powers.... I chose to but an END Reserve for the "ring". I bought a large pool with a recovery rating. All the powers are drawn from the Reserve, If the reserve is depleted, there is a fail-safe... a simple forceshield that activates ONLY when the Reserve is empty. That was bought at 0 END. But with charges to represnt a limited time.