I just had a quick question and wanted everyone's opinions.

I'm making a 2D demo game for a resume which I want to post online. I'm applying as a programmer position so I don't really have my own art. I am planning on using sprite sheets and tile sets from other games in order to create just one or two levels on my demo. I will give credit at the bottom of the screen and state that these sprites are not my own.

Is this a good idea or could this be potentially "dangerous" in the illegal sense?