Activities for 15-month old?

[annabanana123]

Some activities my son loved at that age:

Dry erase markers on a sliding door/ french door panes. (tape around the edges in case they miss it, any painting tape will work).
Finger painting
Anything involving a ball.
Matching and stacking games. He was/is a bit OCD and loved lining things up in order.
Obstacle courses (age appropriate)
Splashing in any sort of pool or tub. Tub crayons were also a big hit but they are harder to clean up than they'd have you believe.