Eco Eggs - How can I make my washing smell sweet?

Hi, I've just bought an eco egg and I'm loving it, however, I would really like my washing to smell sweet when it comes out of the machine. Any bright ideas on how to make it smell nice? I thought about essential oils but would the oils spot the clothes and nappies? Or effect the absorbancy?

I don't use them myself, but I know some people put lavender or tea tree oil in with the final rinse to leave a nice smell. I think a couple of drops are enough to make a difference, but do no harm to the clothes.