I can't stand matching figures in units that aren't supposed to be carefully uniformed and well drilled. These guys certainly shouldn't be that, so I asked if it was OK to customize.
Another friend had enough spare horse heads to allow each horse to have a different head, though I'd have to slice off the heads from the solid cast horses. He also had a Chaos Marauder Banner going unused. Still another friend had some crude "monster" weapons, spare polearms, some chaos shields, and some chaos space marine heads. Well on my way now!
From there, I went to Ebay and grabbed some vampire shields and banners and some chaos soldier weapons arms from Horde-O-Bits (check him out, it's unbelievable).
So it took some hacking and rebuilding of arms, some piecing of new helmet horns and even some carving down of new helmets and helmet ornaments by hand,
but I have 10 figures with...
No Matching Horses (heads at least)
No Matching Rider Heads
No Matching Weapons
No Matching Shields