We live in Saudi Arabia and its impossible to find any super Mario decorations here so I had to create my own.
I printed some posters and put them up so we would have some Mario decor, I also had a big Mario stand up done out of foam. I used all primary colors and used printable boxes filled with rice to hold down the balloons.
We had some video game music playing in the background. I also made my own pinata. For prizes I gave out chocolate coins and even made my own cake.
Each child had a Mario and Luigi hat I sewed (very easy) and girls got a plastic crown. For the treat bags – I used printable iron-ons on a sash bag at low temp and put a Mario Pic and his name.