MYOs (aka Make-Your-Owns) are an item that grants you the ability to create your own Bubby design based off it's corresponding rarity. (Rarities are Common, Uncommon, Rare, Ultra Rare, and Special as seen above)
MYOs can be purchased from THE HOARD with coal, a currency earned by participating in the site, mainly by drawing or writing about Bubbies. You do not need to already own a Bubby to earn coal- you can always draw or write for another person and earn coal that way!
It is possible to obtain MYOs with USD, but only when specific sales are up. You can always check the news to see if any sales are going on.
You can also obtain MYOs from other users, as there are an abundance of them floating around. Ask around in the discord, and you might get lucky!