Although the tutorial focuses on girly colors, you can easily use darker reds.
For the guys, you could use plaids or checks with reds.
For kids, you could use some of their fave outgrown clothes, the ones with dinosaur or cartoon or superhero prints.
It doesn't have to be a pillowcase, either. Give your most beloved crafter a tote covered with hearts. There is no limit to the ways you can use this technique.
You can use remnants from the fabric department or old blouses, shirts, and even curtains and other things in your rag-bag if they are crisp and of the right colors.
This came in one of my daily e-newsletters from CraftGossip.
For other projects in my series, just look along the right sidebar for the label "Valentine Projects." I will post only tips that do not require knitting, crocheting, machine sewing, tatting, embroidery, or any other skilled technique.
If you are feeling lazy, check my Etsy shop for items for your gift list.