I need some suggestions.

So, yesterday I did that eight hour painting of the statue from Undertale. Remember that? Well, that was a painting rather than a drawing because someone challenged me to the "One Brush" challenge, which is apparently a thing? (They might've made it up, but I went with it.)
I chose a watercolor brush and watercolored a statue. That was fun.

Now, today, I wanted to give the 3 Color Challenge a shot.

First off, what medium should I use? Digital or Copics? Probably Copics would make more sense, but...

Secondly, what should I actually draw? See, I need to draw something before I pick my colors, because knowing the colors will affect the drawing.
I'd like to do something from the following fandoms:
-Undertale
-Gravity Falls
-Warriors
-DC
-Steven Universe

And I'd like to do something slightly symbolic, so preferably not a character (though Mega Flowey would be pretty cool tbh). Like, instead of drawing, I don't know, Monster Kid walking through Waterfall, I did the Statue.

However, I don't want it to be an iconic symbol. Like, I'd prefer to avoid doing a Soul or a Buttercup from Undertale, or the Journal from Gravity Falls.

Like I said, these are just guidelines. If you'd really like to see a character, or if you just want me do draw a dog or cat or something, still let me know! I have honestly no idea where to go with this, so any suggestion is appreciated.

If no one suggests anything... I'll figure it out.. But I'd appreciate it if you could give me some ideas!