thursday: where's Kelso's green ball??

yes you heard me, can you find it? no..? let me explain. Kelso always plays with a green ball in grans house, now he seems to hid it somewhere and we can't tell where it is! last time it got lost I dreamed the night before I would go to gran and pick it up right away.. and I did! so let's hope I dream where it is before thursday. if not, please help me find his ball!