Oops, it doesn't look like 'picture trend day' is a national day..

Other days

ruby

Ruby Day
lumpy rug

Lumpy Rug Day
one

One Day
eat what you want

Eat What You Want Day
self appreciation

Self Appreciation Day
reading

Reading Day
emoji

Emoji Day
brow

Brow Day
bow tie

Bow Tie Day
unicorn

Unicorn Day