There are solutions for a sphere that bends light in a way that it appears to not be there at all and remains invisible when viewed from any direction. It has a hollow center where an ordinary object may be concealed. These solutions require meta-materials with refraction indices less than 1. Such meta-materials do exist, but currently, require some very special conditions that make them impractical for building something out of.
I have not heard about anyone actually building one of these, but things look promising at least. However, something even remotely resembling a practical invisibility cloak is still a long way away.