Mine used to have the purple/pink splash on the side of it:

I had it professionally removed in 2002, when the car was only 10 years old. In the last 3 or so years, the area where the decal was is now quite obvious in the right light, where you can see the paint is darker in that splash shape =)
So if you like the decals, then replace them. Because you're going to see where they were if you take them off!