Ok, if you're finding chamomile for MORE than you pay for rose, I would NOT be using those oils. Rose is extremely expensive, one of the most expensive oils out there, and for you to find chamomile that costs more, something just isn't right. I'd stick with the high quality stuff - after all, that is the point of making your own products - to improve the quality of the items, and know with confidence what is soaking into your skin. Using poor quality oils would defeat the purpose of all of that.
In the US, an essential oil is only required by law to have 5% of the name of the oil on the bottle to be sold legally as an essential oil. So that bottle of chamomile or rose could only contain 5% of actual chamomile or rose oil and the rest may be carrier oil or other fragrances. I have compared the oils that I use next to other oils, and the quality of the smell is completely different. And the results are in what the oils can do to heal the body, which is an added benefit for a project like this.
For sleepy time you might try Ylang Ylang, or even Valerian or Spikenard. The latter two have odd scents, so you'll need to find something to pair them up with to make them pleasant, but any one of those oils would be good for a relaxing/sleepy type of scent.
As for cellulite busting look through my links for the "Nutty Butt Butter" that came off of Crunchy Betty's blog. That sounds exactly like what you are looking for to market.
I wouldn't try anything before a year of age though, just because of how delicate their skin is.
