With the help of the GamingSteve.com community, I discovered a problem with the approach outlined in this thread. While it is minor, I figured I would pass it along. If you do not remove the Spore_Game.package file from the C:/Program Files/Electronic Arts/SPORE/Data folder, you will notice some odd duplication behavior. One user reported duplicate parts in the cell editor, and I noticed duplicate entries in the rewards pane when unlocking new badges. Thankfully, removing the old file resolves the problem.
Actually, my mod is only part of the game_package. No one has reported the duplicate glitch (I encountered it in my first few attempts, which is why it is this format) although a few people have been having a rough time getting my effects to over ride the default ones. I am still investigating, but would certainly appreciate any feedback.
I should say ALMOST everyone seems to be using it OK. I have remeoved, and re-installed it on my sytem several time trying to find where the difficulty is for others, but have had no luck yet. Besides what I posted earlier anyway, it worked for a couple people.