You can change the color scheme used by the app, by customizing another palette.
Fonts
The app integrates GoogleFonts package, so there is already a large number ready to use integrated into the app. To change the font override the textTheme property in ThemeData and use one of the text themes available in google fonts:
theme.dart
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ThemeData(
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...
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textTheme:GoogleFonts.poppinsTextTheme(...),
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...)
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Extra properties
In the case you need extra properties such as spacing or custom colors, to include into theme data, you can use the extension AdvancedThemeData