decorate (someone) for (something)
To honor with an award for a special accomplishment or achievement, often one linked to heroism. The soldier who rescued his entire platoon was decorated for his valor in a ceremony earlier today.
decorate (something) with (something)
To embellish something by adding adornments to it, often for a particular occasion. I decorated the room with crepe paper and balloons for the birthday party. My little niece adorably decorated her card to me with lots of stickers.
decorate someone for something
to award someone a medal or ribbon for doing something important or brave. The town decorated her for her heroic act. She was decorated for her heroism.
decorate something with something
to adorn or ornament something with something. I will decorate the cake with roses made of sugar. Can I decorate your car with streamers for the parade?