Lucky seems to cause the random events to more often be in your favor, such as finding Ranger Class ships. Although, even without "Lucky" checked, you still have a chance of these events happening. MaverickMW is also correct that "Lucky" also helps in invasions and maybe even space battles. Your luck might affect the advantage role when invading/defending a planet, or maybe it helps determine who shoots first, I don't know, but it does seem to help.
As for Creative, in my opinion, it does absolutely nothing. It may do something, it may not, but I have yet to have it actually be benficial. I was originally thinking that it would give you the chance of being able to research some of those special techs, such as "Subspace Rebounder", without having to be aligned with good, but that doesn't seem to be the case.
Also, even though you steal techs not related to your alignment, you still don't get to actually use them. Yes, it's a bummer...