Currently, the only way to customize your account is with color. They all share the same 'vault' icon. This means that if you have separate accounts the icon has no added value for quickly visually distinguishing accounts.
I know there's an option to upload custom pictures, but it's a bit of a hassle.
I would love an update that includes tons of different icons to pick from. Like a palm tree with beach for holiday; a wedding ring for wedding savings. You know, choices!