So simple a monkey could do it. Seriously!
Take any noodle uncooked and put into a sand bucket or any other container that you don't mind getting stained. Add a few drops of food coloring and mix well until all your noodles are coated.
Then spread mixture onto an old towel. You may want to double your towel as my mixture leaked through and stained my counter top. Let dry about 2 hours and voila easy texture play
Kids love to play with new textures and colors. This could also be done with rice. Jada and her little friends played with this for a good hour before finding other things to play with.