I like Kes's suggestion, but maybe that's because I've just used that colour scheme on a model narrowboat I'm building. There's a local firm of builders round here with that colour scheme on their vans and it looks really good.
For some reason, cream with a light blue roof puts me in mind of a Bedford CA, but I don't know why.
I always think classic panel vans look good in a dark base colour like dark blue or burgend ... burgan ...... dark red! :I
Perhaps dark blue below and cream above or ....
Lets face it, I haven't got a clue really. Perhaps playing with colours on photoshop or similar will help. Whatever you choose it will look good, it's a Commer.