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 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?