I'm not sure about aroma pastes to be honest. The easiest way would be just to get the essential oils you're after and add them in. Any place that sells essential oils (Some Drug stores, aroma therapists, new-age stores) will often have things like Lavender.
The paste was probably just a colouring paste mixed with a few drops of the essential oil. The FDA has a database of all kinds of oils and substances that can be used as flavourings and weather or not they're safe to use:
www.fda.gov/Food/FoodIngredientsPackagin...stings/ucm091048.htm
Personally, I tend to use this list since it saves me looking through the rather daunting 'wall of text' presented by the FDA.
http://www.essential-oil-mama.com/gras-list.html
Hope this helps
~Aestolia