Generate materials by texture or material?..

Hi..

i´m currently using "by texture material generation", actually i´m just using only one kind of material (toon shading), all my objects use toonshading, that means i can get performance if i use only 1 shared material for all the objects, but each object has its own texture, while i´m importing the object, unity generates a material for that texture, so, if i have 10 toon objects, there are 10 different materials, because there are 10 different textures, i think this is not good to gain performance,, :-|

is there a way to generate 1 shared material for all my object taking in mind that each object has its own texture?..
i know i can solve this with atlas, but, if there is another way, i will go for it..

some idea?

thanks.