What do you think this sentence of a song means: "draw tiny pictures round all the dead leaves"?

The song is called The Rat, here are the complete lyrics, but I'm interested in the meaning of that specific sentence above, if you have any idea let me know, thanks.

Shoot from the back / Take good aim

Make sure I'm dead / Bang! Bang!

Cause I'm The Rat / No mistake

Under the bed / Where you sleep

Crush the skull / Make me tame

Sweep it up / Hide it away

No moral shown / No explain

Stupid human / **** for brains

Draw tiny pictures round all the dead leaves

Bag and burn, Bang! Bang!

Float your judgements across the breeze

Bag and burn, Bang! Bang!

Live inside your Jesus dream

Bag and burn, Bang! Bang!

Get some sleep / Lie in wait

Until the day / I burn away

Forget the cause / Present the case

Bring me down / Lose your worth

I'll follow you / To the grave

At the gates / I see the passing saved

The judge be judged / The wretched be saved

You throw a curse / Across your name

Draw tiny pictures round all the dead leaves

Float your judgments across the breeze

Watch them float off to never be seen

You live inside your Jesus dream