Do you have a Cuttlebug or something similar? For some texture fun, get it out!
Have your child feel the textures on each side of the folders. Are they smooth? Bumpy?
Help your kiddos make a texture on some paper or cardstock. Ask them what they think will happen to the paper. My boys thought they would make the smooth cardstock bumpy when we used the machine with a texture folder. We ran the cardstock through and, sure enough, the cardstock was made bumpy (texturized)! This took some coordination, but the boys loved being helpers!
We experimented with texture like this initially when we were learning the letter T, but have had fun with it several times since then!