Add-on Post color

I'm looking for an add on that would change background-color: #FFFFE9; to posts/threads you make to the controls below:

.messageList .message
.message .editDate
.message .messageInfo

This should only be visible to the owner of the post/thread and not to others. This makes it easy to identify your post in a long thread.

Not sure if possible, figured I'd request it none the less. If this is doable without the need of an add on, I'd love to hear how to do it.

Peas and Apples.