DIY Christmas Ornaments Made With A Plastic Cup 

Super cute but I would be worried about the toxic fumes you fill your house with when "cooking" them.

Some cups don't work - The cups need to be recycle 6. The 9 ounce size other information from another website. Heat to 350 F on cookie sheet with foil on it. One site uses CDs when the cups come out of oven. I think permanent fat tip markers work better.

Works better if you punch the hole before you melt the cups

Do this in a toaster oven outside. The fumes are horrible.

What temperature please?? Celsius or Fahrenheit

What size cup do you use?

Can you use red solo cups 0:24

0:19 Looks kinda suspicious?

250 degrees