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We study the elasticity, fluctuations and pinning of a putative spontaneousvortex solid in ferromagnetic superconductors. Using a rigorous thermodynamicargument, we show that in the idealized case of vanishing crystalline pinninganisotropy the long-wavelength tilt modulus of such a vortex solid vanishesidentically, as guaranteed by the underlying rotational invariance. Thevanishing of the tilt modulus means that, to lowest order, the associatedtension elasticity is replaced by the softer, curvature elasticity. The effectof this is to make the spontaneous vortex solid qualitatively more susceptibleto the disordering effects of thermal fluctuations and random pinning. We studythese effects, taking into account the nonlinear elasticity, that, in threedimensions, is important at sufficiently long length scales, and showing that a``columnar elastic glass'' phase of vortices results. This phase is controlledby a previously unstudied zero-temperature fixed point and it is characterizedby elastic moduli that have universal strong wave-vector dependence out toarbitrarily long length scales, leading to non-Hookean elasticity. We arguethat, although translationally disordered for weak disorder, the columnarelastic glass is stable against the proliferation of dislocations and istherefore a topologically ordered {\em elastic} glass. As a result, thephenomenology of the spontaneous vortex state of isotropic magneticsuperconductors differs qualitatively from a conventional,external-field-induced mixed state. For example, for weak external fields $H$,the magnetic induction scales {\em universally} like $B(H)\sim B(0)+ cH^{\alpha}$, with $\alpha\approx 0.72$.Comment: Minor editorial changes, version to be published in PRB, 39 pages, 7  figure

Elasticity, fluctuations, and vortex pinning in ferromagnetic superconductors: A columnar elastic glass