I don't really like Vernal Creative. Kinda' sounds like Vermin. PGO Creative seems a bit dull aswell.
Urm,
http://www.thesaurus.com used to help me alot. Just tap in something like "youthfullness" or "freshness" and scroll through the hundreds of words of the same meaning. Occassionally you'll get some good ones.
Hope that helps :S