Well, there's a nail polish one... So I thought I'd start one about lipsticks!
For me it's anything bright, orange, pink, purple and even blue and green. (Gosh flirty orange, Revlon fuchsia fusion, Urban Decay pandemonium, NYX little denim dress and MAC show and teal are a few examples.)
Although there are colours I wear all year round too, like black, grey and dark purple.