Use server culture as the source
Mascots, recurring jokes, role names, game moments, and community catchphrases can all become sticker ideas. The more specific the reference, the more likely members will use it.
Keep reactions broad enough
A server pack still needs common reactions: yes, no, wait, nice, panic, laugh, suspicious, and good night. These help the pack stay useful outside one joke.
Make text readable for dark themes
Discord users often use dark mode. Strong outlines, high contrast text, and simple silhouettes help stickers stay readable across themes.