Spray a 9x9 pan with a non stick coating spray and set aside.
In a large sauce pan, melt the butter over low heat.
Add the marshmallows, stirring constantly until melted.
Remove from heat and stir in the cereal and salt (optional) until well-coated.
Transfer the cereal mixture to the prepared pan and press down firmly.
Cool for at least 30 minutes.
In a double boiler, melt the white chocolate melts. Let cool for 1 minute.
Pour the melted white chocolate into the golf ball molds and refrigerate for 30 minutes.
Line a cookie sheet with wax paper and set aside.
In a small microwave safe bowl, add the dark green chocolate melts.
Microwave for 45 seconds and stir until melted.
Once the golf ball molds have hardened, dip 6 of the Rice Krispies bars into the melted dark green chocolate to coat evenly.
Place the chocolate coated bars on the cookie sheet and immediately place a white chocolate golf ball on top of each bar.
Let the bars "set" for 30 minutes to allow the chocolate to harden.
Repeat steps 10-12 using the lime green chocolate melts.