What are some good proverbs I could write a 1 minute speech on?
it's for a school project
You could use the proverb "The best things in life are free." The proverb that you choose will depend on the topic of the speech. Visit http://homepage.smc.edu/reading_lab/american_english_proverbs.htm for more suggestions.
"The 50 most important English proverbs" ~http://www.phrasemix.com/collections/the-50-most-important-english-proverbs