One of the gifts I made this year for Christmas was a bean bag chair for my daughter. I used a tutorial I found online, but just made a bigger size. It was super easy sewing wise. What was not easy was getting 10 cubic feet of 'beans' into it on my own! Oh my, I made quite a mess I can tell you, which all had to be cleared up before the little lady came home from school!
I made a liner bag for it so that I can wash the cover if necessary. I bought a flat sheet to do that! I made the outer from a lovely fluffy throw. If you are interested you can find the tutorial I followed here. Remember that i made mine much bigger though. She totally loved it!