Do you have a child who refuses to participate in messy play?
Grab a Ziploc bag and some hair gel. Place about ¼ cup of hair gel inside the bag, seal it and have them trace a path through the gel. You can also place a little more hair gel in the bag and some confetti or small toys and have the child move them around.
As your child gets comfortable with touching the closed bag- put a small hole in the side of the bag and let a little gel leak out. This may be tolerated the first time you try it but it also may take awhile. Keep trying though. The only way your child is going to start tolerating textured is to expose them to different ones in a fun way.