I'm actually going to pull a few ideas from the other posts and add it to mine. I suggest a rag quilt with a variety of tactile fabrics as well as I spy, hungry caterpillar, or very colorful familiar objects; things the students would see in every day life or school.
I made a tactile rag quilt for an instructor a few years back (for her baby who had learning disabilities). It had a denim rear pocket, corduroy, satin, plaid, velcro, and a few other blocks that were every day items and solid colors. Good luck!