I found all these ideas on Pinterest and will link to each of the original sources.
"Thank for Helping Me Swim through the School Year"
Attach the tag to a bag of goldfish crackers. Very inexpensive!
"Thank You for Quenching my Thirst for Knowledge"
Purchase a tumbler and fill it with lemonade or tea packets from Crystal Light.
Jar of Hershey Kisses
You'll need a 3/4" punch to cut out the circles for the bottom of the kisses. Attach the circles using a glue dot...a little tedious but super cute!
Framed Teacher Quotes
Print off and place inside of a 8x10 frame.
Washi Tape Initial
Purchase the initials at any craft store and cover with washi tape. Seal the letter with Modge Podge. So fun!