I sculpted the potatoes in Sculptris in order to achieve more detail than Maya. I also find it easier to sculpt this way, rather than use the shapes in Maya. 

After messing around with styles - making the potato lumpy and not so spherical

The going back into Maya I went File > Import in order to bring them in to Maya. 

I followed the usual procedure in adding UV mapping and then added several different potato textures found from google, in order to make sure there was some variety was in the potatoes. No two potatoes are the same! 

Final Potato Models

Texture added