border design help

Hi everyone 

As a newbie we finaly got front gsrden done ,now on to back garden whivh isnit huge but not to small 

Fence has been double paneled and painted a charcoal grey ,which i love 

Now borders are about get dug out this wkend and i cant have them too wide ,maybe 1 and half metres wide

Im looking to have white,orange and green theme of colours 

I will have white climbers on fences ,but not sure how to mix white and orange together ,do i do like one white then one orange ive no idea 

Ive also thou maybe break up between colors with foliage  green plants but again no idea what to do 

Sorry for ramble on :. (