This Instructable is so easy that it's almost unnecessary, so I'll keep it as short as possible.
A jar (any size)
A candle (votive or tea light)
A piece of card stock or computer paper
Step 1: Choose and prep your paper
Card stock looks more legit (non-homemade,) but computer paper will appear brighter
Choose whichever you'd like and then roll your paper so the ends are only slightly overlapping and then tape it.