Hi Roger,
I found an app in the store by Cupel Apps, its called "Instant Cart" and you can modify it to change colours etc.
Its a one off fee of $25... Or so I thought. I clicked on it today to get more information for you and it updated the app and changed the look and feel to colours I am not happy with and I cannot make changes now unless I pay another $25 which I am not happy about.
It was fine before, this is a bit disapointing.
I did add it however, as I had a couple of customers say they couldn't find my cart, so its a good idea.
:)