I have to agree with operaguy - to make a REALLY convincing celeb look-alike, you would need to out in more work than just using FSP (although I believe it would be a good start!). But as a way to generate a range of interesting faces that no-one else is using, it is a great tool.  In case there is any confusion, FSP generates the morphs AND the texture from a single photo. I usually edit the texture to tidy it up, but again, it is a great starting point.