I guesss one for calming down and relaxing. I have a VERY active 2 year old that needs a relaxing scent for baths before bedtime. I wanted to try Lavender and chamomile but I can't find any Roman here. Just German.
Also maybe a kiddie scent. Something cheery. All the blends that I have tried so far are "adult" scents..
Have you tried Lemongrass? Its a wonderful fresh, citrusy scent My little sibs adore it! They also love coffee soap, with strong brew and grounds. The coffee soap doesn't really smell, but they love the texture and its great for cleaning the dirt off their feet
Lavender in lotion for a pre-bed massage worked wonders on my son when he was cranky (and did some good for me, because it allowed me to calm down too). Just be very sparing with use, remember that their skin is so much more delicate than ours.