Pretty simple thing...kinda for women though....bath salts. It's really easy.
3 cups Epson Salts
1 Tablespoon Glycerin
for coloring you can use food coloring...very inexpensive or you can purchase dye for soap making and such at places like Hobby Lobby.
for scent you can use any perfume or you can buy various scents at Hobby Lobby, which is my preference.
In a large bowl, mix Epson Salts and Glycerin.
Add scent...amount is your preference...and mix.
Add coloring...amount is your preference and mix.
You can divide it into smaller portions...I like to divide it into 1 cup portions and put it in those nice little gift bags you can purchase at the dollar store.
My great niece and I made 100 cups of the bath salts this weekend to donate at a local Christmas Gift House for kids. She's 9 and loves making the stuff.