My DS is 16 months and loves things he should not have (mobile phones, remote controls, wallets) and doing things he should not be doing (currently climbing and chasing the cats).
Real toys that I try and encourage are -
bricks for building, banging together, knocking down - I demonstrate and cheer!
wheeled toys for pushing along, making appropriate noises for - again I demonstrate with enthusiasm!
books with flap, touchy feely things, etc
He also loves cardboard tubes, saucepans, magazines, boxes to empty and fill, things to post through the stair gates and cat flap, musical toys,