Not all of them but most of them based on my observation. For your info, half of my tie collections are blue in colour. In this case, check out the art project by Jeong Mee Yoon to differentiate colour by gender.
1. Pink hello kitty
2. Blue horse
3. Pink crocs shoes
4. Blue umbrella
5. Pink dolls heaven
6. Blue crayons
Credit :
1. Jeong Mee Yoon’s artworks
