Birthdaycore??
I think it would be a subspecies(?) of kidcore or nostalgiacore
Images:
Main themes:
Shopping at Party City
Breaking pinatas
Eating cake
Bouncy castles
Parties (obviously)
Bright colors (Mostly primary colors.)
Rainbows
Glitter
Streamers
Trampolines
McDonalds Play Place
Chuck-E-Cheese
Balloons
Cotton Candy
Sweets
Playing with friends
Getting and Giving gifts
