Creating art helps us express our emotions and how we are feeling. Being creative helps people focus their minds on processing emotions and releasing them. When a person sits down to create art, it takes their mind off of whatever is bothering them, and helps them relax and destress.
Whatever you create is up to you, but if you need some inspiration below are some ideas:
string painting
rainbow leaf printing
macramé
tape art
collage of your favorite color
watercolor sunset
sculpture of your favorite TV character
More Ideas:
https://diyprojectsforteens.com/arts-and-crafts-ideas-for-teens/
https://www.annarborartcenter.org/projects-for-teens/