As greene asked, the height would help to know if it is a French marigold or African marigold. If it's fairly short and the flowers smallish it would be a French marigold (not sure that I've even seen an African one in a single flat flower). In the colours you're looking for you might start with the "Disco" series of French marigold, there are some example pics on Google:
https://www.google.ca/search?q...