Changing App Icons

I do not have a computer and would like to change my app icons one by one so I don't have to change entire theme based on a few cool app icons. I resaerched and couldn't find much. Found one video on YouTube that claims to show how to do this, but the video wont work, even with skyfire. And with out a computer I cant watch it. So if there are some steps to do this with out w computer I Would appreciate it.