Ambient music with nature sounds.
Music is my number one positive sensory stimulation.
I have it playing through the house all day and need it to fall asleep by. When using it to fall asleep it must be at just the right level. Not too loud, not too soft. I use a remote so I can get the sound just right.
The feel of soft, plush pillows, blankets, plushies, anything that touches my skin.
Clear and cold spring waters. I've stayed in a little too long a few times and couldn't stop shaking afterwards. But I love the feel and the sights of the pebbles with small fish around my feet and the clean feel spring water gives.
Cool mornings either in the forest or by the beach. The nature sounds of the forest.
The small sound of gentle waves on the shore. I like the feel of a smooth, clear, sea around my body also. The feel of the sand under my feet.
The smell of a pine grove.
Here is a strange one. The color of a blue light in the dark. Like the blue of the lights on a runway or Christmas tree. I can just sit and stare at that color in the dark in the quiet. I feel emersed into it and the most peaceful state.