This sweater is so easy and always a huge hit at our ugly Christmas sweater parties.
I just got a shirt from our local thrift store for $3. Then I got some felt and clear plasticy fabric and created a fireplace scene using a hot glue gun to put it all together and attach it to the shirt.
MAKE SURE YOU PUT SOMETHING BETWEEN THE FRONT AND BACK OF THE SHIRT WHEN YOU ARE GLUING (LIKE WAXED PAPER OR A CUTTING BOARD) SO YOU DON'T GLUE THE SHIRT TOGETHER.
I made sure to leave the top of the fireplace scene open (didn't glue that part to the shirt) so my husband could slip his iPhone through. Then he just put on an 8-hour YouTube video of a fire, slipped his phone in and he was ready to go!