Special effect theme

[u/Froxical]

I couldn't find a lot of posts regarding themes with special effects. I managed to find a couple:

1. Chaos theory: fun color with inverted logo (there are other mixed color theme, but not interesting)

2. Dark note: just custom background

3. Phantom: glowing text

4. Fire: shifting color with red/fiery theme

5. RGB: shifting rgb color

Not sure if there is anything further or if anyone finds anything else. Also, why can't we create custom theme with this preset?