How to blend my extentions?

I have blonde hair, it's golden blonde, never dyed it or done anything to it. I bought extensions online that are pink to a deep purple.. I love them! but I have no way to blend them! I want to wear them down but they do not look good! I can't curl them though because they're just plastic! I've just been braiding my hair to the side to blend it. Any other suggestions!?!?