Well firstly, what do you consider "signs and wonders"?
Miracles. You know, just like they are presented in the bible.
People have done amazing things in the name of Christ. . .
Yeah, and? "Amazing things" is a) inherently subjective, and b) not exclusive with respect to miracles. 'Signs and wonders' is generally a reference to miracles -- healing, driving out demons, etc. -- and not merely painting the Sistine Chapel (or whatever you're counting as "amazing things").
. . .and people have also done amazing things in the name of idolatry [link to a Google search for "Obama the Messiah"].
What the actual fuck? Seriously. What the fuck does some nutjob crackery have to do with the price of tea in China? I don't even.
Signs and wonders doesn't necessarily mean supernatural.
Yes, it does, according to everywhere that phrase is used in the bible. Specifically, the word translated as 'wonder' (Strong's G5059) is exclusively used in that context, and indeed the word translated as 'miracle' in e.g. Acts 2:22 (Strong's G1411) is most often translated as 'power' or 'mighty works' everywhere else. If by 'mighty works' something like building the Panama Canal was meant, then probably that otherwise common term would have been used in e.g. Matthew 24:24, Acts 4:30, etc.
But it wasn't. 'Signs and wonders' is the phrase used, and it clearly means miracles, especially when surrounded by things like 'stretching forth their hands to heal.'
He said "the works I have been doing."
You're referencing John 14:12, it seems, and you neglect to provide the rest of that statement (emphasis added):
Very truly I tell you, whoever believes in me will do the works I have been doing, and they will do even greater things than these, because I am going to the Father.
If you're trying to say he's referring to mundane tasks of arbitrary difficulty (e.g. building things), you're still stuck in that whatever Jesus did, his followers will evidently do even greater things. As Jesus is not recorded as having built anything of any significance, but his 'works' are instead listed as building a religious following and performing magic, it seems to me that his followers will either a) build their own religious followings (which is to say, they would no longer be his followers), or they'll be capable of greater magic.
But they're not. Hence OP's question, and by my count there are the same number of miracles being performed as there are satisfactory responses to the question. Hint: it's an integer lying on the interval (-1, 1).