I found these two sites a while ago and thought they were pretty cool. Try your hand at making some digital art! Both are fun, and even a bit relaxing.
Scribbler lets you do just that: scribble! It adds lines between the ones you draw, to add shading and texture. The settings are highly customizable, letting you choose colors, brush stroke, line frequency, and more. You can even upload photos to draw over. Depending on the settings, the added lines remind me of a spider’s web or barbed wire.
Weave Silk lets you draw lines too, but with a mirrored effect and light-like aura. It even offers soothing background music.