Hi Geneieve, Use a paint remover spray that is safe for tiles. You may want to look on the back of the gold spray paint can to see what is recommended. Or you could call Home Depot ask for the paint department and they can help you. Or here is a formula below I found on ehow. =)
How to Remove Spray Paint From Floor Tile
Things You'll Need
Denatured alcohol
Paper towel or cotton ball
Soft cloth
Instructions
Denatured Alcohol
1. Dampen a paper towel or cotton ball with denatured alcohol.
2. Dab the dampened paper towel or cotton ball on the paint. Do not rub, as this can cause the paint to spread. Continue dabbing until the paint has lifted.
3. Spray an all-purpose cleaner or tile cleaner over the area. Wipe the cleaner from the tile with a dampened cloth to remove all alcohol residue.