Dia da árvore I've printed about 15 of these coloring sheets because my kids love decorating the tree in different ways (with crayons, colored pencils, even paint!) *Be sure to read the section about bringing math into the project. Count the hearts!
Zentangle Hearts for Valentine's Day. Watercolor wash over the pen/sharpie? Maybe on watercolor paper?
Doodle Love pattern for painting on rocks and stones - even better if I have a heart-shaped rock. Printables for quilling
coloring for adults - kleuren voor volwassenen
These Back to School Binder Cover Adult Coloring Pages have a multitude of great uses. Consider coloring and then hanging as DIY Wall Art.