Mix the red beet powder into the vodka until it is fully dissolved. Add more if you would like a stronger red color.
Mix together the simple syrup, lime juice and water, and add in the red-colored vodka.
Using a funnel, carefully pour the red mixture into your popsicle molds. Try to put an equal amount in each pop.
Add in the popsicle stick according to the directions on your molds.
Place the molds into the freezer, making sure they are level. Freeze until solid. The freezing time will vary based on your freezer and the size of your pops, but probably 2 hours or more.
White Layer
Mix together the lime juice, simple syrup and water.
Add in the cream and mix well.
You can pre-mix this white layer and let it chill in the refrigerator while you wait for the red layer to freeze.
Carefully pour the white liquid into the molds, distributing it equally among the molds.
Put the molds into the freezer on a level surface and freeze until solid, at least 2 hours.
Blue Layer
Put the blue spirulina powder into your mixing glass and add in the rum, lemon juice, simple syrup and water. Mix until the powder is dissolved.
If you are pre-mixing, chill the mixture until the white layer is completely frozen.
Carefully pour the blue liquid into the molds so there is an equal amount in each pop.
Put the molds back in the freezer on a level surface and freeze until solid, 2 hours or more.
Serve or Store
Once the pops are completely frozen, take them out of the molds. You can serve them immediately, or wrap the individual pops and put them back into the freezer.
Notes
These pops will be about 6.5% alcohol (depending on the percentage of alcohol in the vodka, gin and rum that you use). The vodka, gin and rum should be in the 40-45% range.