Customised colours where balance is shown

When you switch to a different currency, have the abillity to change the colour where balance is shown to a different colour for a different currency so it stands out more.

or

or set the whole app to a different colour. Right now its blue, but maybe the choice to change it to red or purple? only where the balance is shown everything else is fine. I think it would feel very personalised to each user that way.

thoughts?