Several Clifford algebras that are covariant under the action of a Lie algebra g can be deformed in a way consistent with the deformation of U g into a quantum group (or into a triangular Hopf algebra) U q g , i.e. so as to remain covariant under the action of U q g . In this report, after recalling these facts, we review our results regarding the formal realization of the elements of such "q-deformed" Clifford algebras as "functions" (polynomials) in the generators of the undeformed ones; in particular, the intruiging interplay between the original and the q-deformed symmetry. Finally, we briefly illustrate their dramatic consequences on the representation theories of the original and of the q-deformed Clifford algebra, and mention how these results could turn out to be useful in quantum physics.-Preprint 99-51 Dip. Matematica e Applicazioni, Università di Napoli * Invited talk given at the "5th International Conference on Clifford algebras and their Applications in Mathematical Physics, Ixtapa-Zihuatanejo (Mexico) June-July 1999.