This question came into my brain while I was working in my art journal. For me the answer is a golden retriever, but more generally I would have to say -
:-)
And here is a visual -
<3
I have also begun something I call pattern journaling. Here's an example -
Platinum carbon ink, Sharpie pens
The two features are random line work and color. It's fun to create these patterns and addictive, too.