Tea lights. Either the real kind, or the flameless battery operated kind.
Spray paint. Not pictured. Whoops.
Baby Food Jars - on hand, or on someone else's hand. You can buy them. But you should really check around first. FREE
Fake tea lights - dollar store; $1 for two pack
real tea lights - dollar store; $1 for 6 pack
washi tape - walmart, joanne's; anywhere from .99 - $2.49 ish
Uh, like negligible. Maybe 5 minutes? Something like that.
I had the jars and the tape. Wait. I had the tea lights too. A FREE GIFT!
And, in case you need a little printable tag action for your very own tea light holders: