you can do Mustard(yellow one) and Squiggle(red one) they are my favorite guppies i like Squiggle because i saved him from the filter when he was a fry thats why he has a slightly bent back but he's a very happy and healthy fish now and Mustard is one of the first tropical fish i got
sorry the photo of Squiggle isn't a very good one i think it shows you what he looks like though