I have some different bath salt recipes.

Colored Bath Salts:

1 cup epsom salts
1/4 cup kosher salt or sea salt
food coloring
fragrance oils (optional)

Mix together epsom salts and kosher salt. Add a few drops of your favorite color and stir well. If you would like your salts scented, add a few drops of fragrance oil. Store in an airtight container - preferably glass. Add 1/4 c under running bath water.
Note: you may substitute cornstarch or baking soda for the kosher salt.

Fine Bath Salts:

1/2 cup fine sea salt or table salt
1/2 cup baking soda
1 tsp sunflower oil
2 to 3 drops fragrance oil
1/4 tsp vitamin E oil (optional)

Place all ingredients in a resealable plastic bag and knead until well mixed. Add 1-2 T to bath under running water.

3-2-1 Bath Salts:

3 cups epsom salts
2 cups sea salt
1 cup baking soda

Mix together in a BIG zip lock bag. Add a few drops of fragrance and/or food coloring and knead to saturate the salts. Let sit overnight with one corner open just a little so the mixture can "breathe". Use 1/4 cup per bath.

I have a million more recipes - if you want them let me know! Enjoy!