Oranges

Occasions (as in "Special")

Oak trees

omelets

Ohmygoodness!

orange blossoms

owls

Otters (love otters)

Oceans of beauty

olive oil on my salads

Oregon

omphalos

ophidian

osculation

oscilloscope

otyugh

Optimists

Are people too shy to say "orgasms"?  LOL

orgies

oranges

owls

oval tables to gather round for meals or table games

Olive (my friend)

octopus  (a strange animal)

ostrich  (a strange bird)

otters

Other strange, different, funny, interesting animals

other people as well 

oestre

ovipositor

ode to joy

ovum

orlando (fun book...)

Oranges
Oak Trees
Oregano
Olive Oil
Owls
Onions (small green ones fresh from the garden)
Omelets
Oh My Goddess (anime)

One - unity