We do have some interesting PrCs from MoI we haven't used yet.
Most of them I'd say are too good to be proper Iron Chef ingredients, with one exception.
Spinemeld Warrior is a horrible meldshaper (thought still somehow better than an equal number of soulborn levels) and it makes me sad. It's also the only 3.5 class I've seen that thought level titles were so important they deserved a spot on the chart.