  We construct the gravity duals of the Higgs branches of three-dimensional
(four-dimensional) super Yang-Mills theories coupled to $N_\textrm{f}$ quark
flavors. The effect of the quarks on the color degrees of freedom is included,
and corresponds on the gravity side to the backreaction of $N_\textrm{f}$
flavor D6-branes (D7-branes) on the background of $N_\textrm{c}$ color
D2-branes (D3-branes). The Higgsing of the gauge group arises from the
dissolution of some color branes inside the flavor branes. The dissolved color
branes are represented by non-Abelian instantons whose backreaction is also
included. The result is a cascading-like solution in which the effective number
of color branes varies along the holographic direction. In the
three-dimensional case the solution may include an arbitrary number of
quasi-conformal (walking) regions.
