True. Creativity could be the only thing that we humans seem capable of than our machine brethren. But what is creativity? Do you plan to be creative ? No. Creativity is a random event that coincides with the event you want to happen. So we can talk about creativity in terms of probability. We always say necessity is the mother of invention and creativity. Speaking mathematically, that would mean a probability that is very very unlikely, literally a random probability. So creative gain can be summed up as a random favorable event.
Now robots are far far more superior than us in generating and analysing random variables. Infact that is how internet works. So all that robot needs is a very good random favorability analyser to come up as creative.
For an example, imagine you need to stick something up. You don't have a glue. You look for something in your neighbourhood. This trait of looking for an alternative is primarily when creativity happens. If an AI learns to look for alternatives too, it will definitely become creative.
There is actually a band called Compressorhead composed entirely of robots. They are programmed to play a certain song. Now all I have to do is to give that robot a program where it learns to reach the same goal through a different possibility. It's quite hard to program but not impossible.
Feel in music is obtained by techniques such as vibrato. Feel in a painting can be obtained by getting a stroke. By voluntarily pressing at certain points and letting lose at others. Every field or art has a completely mechanical way to mimic the "feel" of an artist.
Now our robot has this "feel" and "creativity", two things humans are known for. I don't think the day is too far.
The stronger a light shines the darker are the shadows around it.