How to swap object

Hey guys, I'm a beginner in unity and wondering how do I change an object once everytime it has been thrown. I'm trying to make a "paper toss" like game and everytime the user throws the object a new object appears for them to be able to throw it. (that's the main goal) , Would really appreciate it , if i could get some help. I've already got the object to be thrown into a bin but now i have to swap it out everytime the user throws it. Thanks!!!!