buy some fairy lights some come in a net fashion and attach to the ceiling, buy some lava lamps and a bubble machine even torches are great to use. you could also buy a projector.

a fan is worth having in your sensory room if you cant afford a wind machine a c.d player with calming music or animal sounds.

get some textured materials i.e fur silk leather suede and make cushions.

You can get some really good textured wall and floor tiles so have a look at them.

dont forget the senses of smell and taste while making your room

contact Mike Ayres via the Internet for a broucher on sensory rooms