Suggested Themes:
New Year
Alcohol
Sleepovers
Kissing
Parties
New Beginnings
Hope
Valentine's Day
Hearts
Love
Kissing
Candy
Colors - pink, red, white
St. Patrick's Day
Alcohol
Colors - green
April Fool's Day
Pranks
Jokes
Rain
Merriment
Easter
Easter Bunny
Candy
Church/Religion
Easter-egg/scavenger hunts
Mother's Day
Mothers
Parents
Children
Childhood
Presents
Love
Togetherness
Surprises
Father's Day
Fathers
Parents
Children
Childhood
Love
Presents
Togetherness
Surprises
Independance Day (Political holiday - varies for each country.)
Freedom
Rights
Halloween
Candy
Costumes
Fun
Parties
Scary/spooky
Thankgiving (Political holiday - varies for each country.)
Feasts
Turkey
Ham
Family
Friends
Togetherness
Fun
Parties
Giving Thanks/Gratefulness
Football (American Football)
Hanukkah
Gifts
Family
Winter Activities (Snowmen, sledding, snowball fights)
Christmas
Trees
Advent Calendars
Winter Activities (Snowmen, sledding, snowball fights)
Feasts
Gifts
New Year's Eve
Alcohol
Celebration
New Beginnings
Hope
Misc.
Baking
Party Preperation
Invitations
Hugging
Contributions more than welcome for additional themes.
Any theme that applies to more than one holiday is listed under every holiday it applies to. Holidays are in bold, followed by the list of themes. Please feel free to add on to this list, as I don't know every holiday that anyone may want to write about, or every theme that could apply to them.