Another tip I just remembered -- using very bright, neon shades of orange and yellow is useful for those who have certain types of vision impairments (cortical vision impairments) as these are often the only colors seen clearly.
I also liked stitching a row of tactile trims into the quilt at intervals -- a snap strip, remnants of zippers, some interesting trim with grommets in it. These were handy for attaching toys or other small objects. We had a collection of bean bags that went with the quilt, so the child could play matching and memory games, finding the quilt square texture that matched a bean bag.
The pockets were fun for adding little sachets w. different scents (don't sew into the quilt, as they don't wash well). We also had little pillows, the same size as the bean bags, with sound makers sewn in -- you can put a jingle bell or two pennies inside a tictac box, tape it shut securely, and then wrap it in batting and sew securely into the little pillow.
RST