Check out the recipe section for things like Hummus and Roasted iChick Peas and don't forget things like nuts! On Phase II, most people do not rely on snacks as much.
As to your questions:
Soy Protein Concentrate = yes
Potato Starch = No
Blue Corn is not different so I'm afraid it's not allowed.
I hope this helps.
Change isnít easy. But if you donít change, you stay the same, and whereís the fun in that?