The thing to keep in mind is that people recognize icons more by shape
than by color.
So a muted background color that does not stand out too much is good,
and make sure that it contrasts crisply with the snake-with-cube symbol.
Anything that blurs the outline is bad. If you want a gradient, you need
to add contour lines to the symbol.
It is possible that the symbol will look good without a background color
if you add a black outline (so it stands out on a light background), and
then a white outline (so it stands out on a dark background).
The scheme might look better if you don't use white and black but some
light and dark grey.
I don't have any preference beyond that. Judging smartphone images from
how they look on a laptop simply doesn't work, and what looks good on a
uniformly-colored background can look bad on a fractal one and vice versa.
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