Some candles, food and beverages: It is very likely that the couple is tired from the frantic celebrations of their wedding and the reception thereafter. They are also likely to be hungry and thirsty as most people do not get to eat a lot at their own wedding. A light meal that is easy to consume along with some beverages like water and some wine would make them feel good. Also ensure that you have lighted a scented candle or two to provide the right atmosphere.
A bath if possible: There is nothing more relaxing and romantic than when a couple is able to shed their formal wear, take a nice bath and get to relax together. If at all possible, do ensure that they have a place to soak their day off together in a bath or Jacuzzi.
We are sure that our tips along with the images here would have given you plenty of ideas for the direction that you will take for wedding first night bed decorations and arrangements.