Converted them mostly:
A Groinbiter from old skaven and goblin bits with some sculpting (making the nose and ears more gnoblar-like for the most part). He's a big fella, but I reckon that's fitting for the champ. He's only a little taller than the others - though he's built like the proverbial brick outbuilding compared to his mates (got hold of some gnoblar 'roids I reckon).
A standard bearer from a regular gnoblar.
The only one I didn't convert was the musician. He's an old snotling model blowing a horn. Bulked up the feet a bit and mounted him on a thin piece of plasticard before attaching to the base to even out the size difference slightly.
Not sure they'll ever see the gaming atble, but was fun to do!