I hope that this little trick will help someone out. While I was setting up my gravatar picture, I decided to try something out. I found out that you can use one Gmail account multiple times and assign a different image to each email with no conflicts. It's effortless to do and here is a picture showing it in action

So you only need one email address to do this. With Gmail accounts, you can put a period after each letter of your email and then use that as a new email. The best thing is that any mail sent to these emails will all show up in your original email account. Depending on how long your email name is with Gmail will dictate how many times you can do this. So now you don't have to have a bunch of different emails, and you don't have to use fake ones. As your business grows and you need a different gravatar, you can use this trick and manage all from one account.