The most common form of oxymoron involves an adjective–noun combination of two words.
Dark light Crazy wisdom
Less often seen are noun–verb combinations of two words, like in a song title of Simon & Garfunkel's "The Sound of Silence".
One case where many oxymora are strung together can be found in Shakespeare's Romeo and Juliet, where Romeo declares:
O heavy lightness! Serious vanity!
Mis-shapen chaos of well-seeming forms!
Feather of lead, bright smoke, cold fire, sick health!
After a long preamble, please provide some samples to create a list of meaningful oxymora:
• open secret
• organized mess