Nice idea: the NZ Greens have a website for creating your own online billboards: voteforus.co.nz
My favourites: freedom to dance, young girl, native bush, Tuis, lakes, to glide, unspoiled beach, cabbage trees, swimming as kids, romance on the beach, the rope bridge, young lasses, earth, and, my favourite, living in harmony.
(via No Right Turn)
Update: added mine: kayaking down the Whanganui River and kiwi road sign.