Am I creative?

I don't think of myself as creative and yet I have little or no trouble coming with ideas when I am assigned a project and given perimeters.  Often my ideas are based on the works of other though those are not necessary in the field of what I am doing.  I have some trouble judging how good ides are but at this point that could be due to inexperience.  I cannot really call my ideas innovative as they are often inspired by the works of other.  Still they seem creative to me.