DOMINOOOOOOEEEESSSSSS (all over my place. then I make someone visit me and open my door. showing of 24/7).
Buckets. (for sandcastles and towers)
Pillows and chairs. (for SUPERFORTS!)
Any board-game. Guess Who can break me out of any sad state.
"Beware Those Who Are ALWAYS READING BOOKS" - Bukowski
Marble run is great stuff! Actually so is anything that moves in some pattern and I can just sit and stare at it. I love visiting a large toy shop here that have trains running on tracks along the ceiling. It never tires me out watching it.
I still have lots of stuff animals around... lego, building blocks, board games (monopoly, scrabble etc), thinking puzzles like rush hour. You can give me pretty much give me any toy and I'll be entertained.