Everyone who is conscious and able to move at least one limb or their mouth can sketch. Really. You don't have to be an old master or a new master or even an apprentice. You just need some sort of surface (paper is ideal) and media (pens, pencils, crayons, markers,...
Be a god among insects. Get yourself creating something.
Who among us (who grew up in the 60s-80s) did not love (or be frustrated by) Spirograph? Did you know that you can spiro til your heart's content right now without worrying about dead pens, pokey paper, or slippage? Uh-huh. You can. Click here and have fun.
Silk is a super cool site for drawing trippy, kaliedescope-y, ethereal artwork. Try it. You will get addicted.
You don’t need Photoshop or other pricey tools to draw and paint online. YouiDraw has a pretty nice interface that it’s too cluttered with ads.
Remember games like Zork and Trinity? That’s interactive fiction (you knew that, didn’t you?) and you can make your own using free tools like Twine.