Hi @MamaLama516
Thanks for reaching out here in the Community!
Roku releases seasonal themes for several dates throughout the year, such as Valentine's Day or Halloween, and Christmas which is only available for a limited time. Your Roku device will automatically display a seasonal theme and then switch back once the season has passed.
To learn more how/about it, you can visit this link here Seasonal themes
Regards,
Karla
If that were true, then I wouldn't have 5 Halloween wallpapers 3 weeks after the holiday and zero Christmas wallpapers.