Catholics pray to the cross because Jesus died on it. What if Jesus died another way like being stoned, would they pray to stones?

I never heard of anyone praying to the gun, knife or car that killed a loved one, there are no scriptures in the bible that shows we should worship what they used to put Jesus to death. Jesus told his disciples to remember what is death stood for and he did this at Luke 22:19,20. "Also, he took a loaf,gave thanks,broke it,and gave it to them,saying "This means my body, which is to be given in your behalf.  Keep doing this in remembrance of me.  Also he did the same with the cup after they had the evening meal,saying : "This cup means the new covenant by virtue of my blood which is to be poured out in your behalf." 

Sorry, Anonymous, that's not what they do.

As I understand Catholicism, their prayers are to God (in whatever form) but they use the saints, and especially Mary, as intercessors. I have never heard of them praying to the cross. I should think the icons and accessories they use (Rosary Beads, for example) are simply a means to facilitate or formalise their prayers and keep them in some kind of order.

It's all a bit moot, really.

Many people view the cross as the universal symbol of Christianity.

But  the Bible indicates that Jesus did not die on a cross but rather on a simple stake. Moreover, the Bible strongly warns Christians to “flee from idolatry,” which would mean not using the cross in worship.Or any other object .—1 Corinthians 10:14;1 John 5:21. 

Jesus said: “By this all will know that you are my disciples, if you have love among yourselves.” (John 13:34, 35) Jesus thereby indicated that self-sacrificing love—not the cross or any other image—would identify his true followers.

I've known lots of Catholics, but I've never heard of one praying to a cross.