Here are my humble two cents thoughts,
A combi Red&White pelamin potrayed that you wish a classic wedding colours.
If you are looking for a matching wedding gown colour,
White will continuosly give your that demure theme..
But if you want something contrast & is up for another new colour, below are some of the ideas that you could explore,
Red, White, Grey & lil of pink (Sweet theme)
Red, White & Black (Elegance theme)
Red, White & Turqousie (Modern theme)
1. Elizabeth Anne Design Flickr
2. Tastefully Entertaining Flickr
As for theme colour for Hantaran, it does not have to be ALL in SAME Colour.
You can always mix & match into the colour family.
But you can continuosly choose 1 colour to be your dormant colour.
I hope i could give you some ideas.
My personal opinion might differ from another personal.
Mya's Tip: Don't scared of choosing another colour! be bold!