I'd seriously contemplated a real collar - a sparkly green one - if only because I was sure it would offend his dignity.
The quote reveals a character's playful consideration of giving someone they know a sparkly green collar. This choice seems to stem from a desire to challenge or provoke that person's sense of pride or dignity. It indicates a dynamic between the characters where humor and possibly a bit of teasing are at play, highlighting their relationship's complexity.
In the book "Omens" by Kelley Armstrong, this moment encapsulates the blend of whimsy and seriousness, showcasing how small gestures can hold deeper meanings. The thought of the collar signifies a struggle between affection and the wish to assert a kind of control or playful dominance in their interaction.