First I thought we'd use some puff paint sort of pens, but they were SO gloppy and sputter-y and would take SO long to dry, so I went for these great pens instead. I found glitter pens and solid colors and they were very easy for them to use. The pens said it would take 4 hours to dry, so we did them first thing (after a couple of minuts, though, they were fine to touch.)
Here is sweet Miss T. showing her finished pillow.
And here is a final pillowcase WITH a pillow inside. A friend of mine said she had girls decorate pillows for the birthday girl - so the birthday girl got to keep them all and adorn her new day bed. I think that is a great idea, too!