  We show that every frame for a Hilbert space H can be written as a (multiple
of a) sum of three orthonormal bases for H. A result of N.J. Kalton is included
which shows that this is best possible in that: A frame can be represented as a
linear combination of two orthonormal bases if and only if it is a Riesz basis.
We further show that every frame can be written as a (multiple of a) sum of two
normalized tight frames or as a sum of an orthonormal basis and a Riesz basis
for H. Finally, every frame can be represented as a (multiple of a) average of
two orthonormal bases for a larger Hilbert space.
