Both Uses

theme
in
A Stolen Life
(Auto-generated)

I have experienced basketball games and theme parks, reconnected with family members, and met some amazing people.
p. 269.9 *

theme parks = amusement parks each of which have one or more basic underlying ideas -- such as the "Magic Kingdom" of Disneyworld
It was crab themed because my daughter loves her hermit crabs Kevin, Devin, and Cheese.†
p. 235.9

Definitions:

(1) (theme as in: theme of the novel)
a basic idea that underlies what is being said or done -- especially in a literary or artistic work
(2) (theme as in: musical theme)
the initial or primary melody of a musical composition

or

(as in "theme song") music that is most repeated in a film, television series, or other theatrical production
(3) (theme as in: wrote a 2-page theme on my summer)
an essay written by a student

(This sense of theme is much rarer in recent decades than in the past.)
(4) (meaning too rare to warrant focus)