We all make mistakes because we are only humans that are not perfect in this world. There are times it's hard for us to accept we are at fault and much worst it's hard to say our sorry straight out. However, there are people that can go straight to a person, admit that their wrong doings and say their sorry but for others they just send out gifts that say "im sorry" if they want to be more creative or shy.
Anyone can give out flowers, chocolates, cookies, basket full of fruits, etc. with a meaningful card along with it. I’m pretty sure if you do that nice gesture, you’ll easily be forgiven but make sure when you say your sorry, you should be sincere.