About New colors or appearences?

Hello my name is Pedro.  I have a question, i wanto to find and use new appearances into my models (instead of colors  like camouflages, or like a aligator skin). I don´t know how to import it and if a use a image it looks terrible.

Please if somebody knows place on the internet to find them and also how to insert it into solidworks I will be really gratefull.

Bye.

P.D: If the word it is not appearences I sorry, I am still improving my english.

SolidworksGeneral