.Joe_F, I once wrote a song I call 'Sun and Rain' that may contain usable opposites. Among the pairs:

Pleasure and Pain
Friend and Foe
Laugheter and Tears
Hopes and Fears
Joy and Grief
Raputure and Woe
Giggles and Sighs
Hellos and Goodbyes
Promises Broken, Words left Unspoken
Loves and Hates
Births and Fates
Supernal and Infernal