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Halloween
Handdrawn
Spooky Icons — Halloween
scary, laughing, jack
Black
64x64
Education & science
Brainy Icons Free — 36 Science and Education Icons
dino, trex, tiranosur
Christmas
Merry Icons Free — 12 Christmas and New Year Icons
Avatar, Man, santaclaus
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Avatars & smileys
Jolly Icons — Part 1: Social Media and Communication
happy, hand-drawn, smiley
512x512
hand-drawn, sad, smiley
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Desktop apps
Sketchy
look, smiley
256x256