Citrus smells fresh to me.
Also, wooden scents. Cedar is somewhat fresh - I have 2 variants currently, one is really sweet smelling, almost a bit sticky if that makes sense and this one isn't fresh at all. The other is very fresh. Still sweet but not as heavy and thus - fresh.
Other fresh wooden scents I can think of are mountain pine, spruce and fir.
Eucalyptus and peppermint can "freshen" other scents.