That being said, I'll get us started

SMURF SPICE
(Per gallon of 60+ % rum)
1/2 a vanilla been (or capful of vanilla extract)
1/4 tsp ginger powder
1/4 tsp chipotle powder
1/2 tsp nutmeg
6-8 whole cloves
1/2 tsp cinnamon
I let it sit for as long as no as I can till I can smell the flavours when I sniff the bottle. Giving it a good shake every day to remix the solids in.
Filter through a coffee filter when ready.
Then to colour it,
1/4 cup of sugar
1/2 cap of vanilla
Tablespoon of maple syrup
And a little bit of rum (as needed to help the sugar disolve)
Heat this in a sauce pan until it caramelizes (should be almost black)
Use a little more rum in the pan to de caramelize the pan.
What you should end up with is an almost black liquid with some caremel in it.dilute your rum to your drinking abv, then Using only the liquid, add to the bottle until it's the color you want. If it's not LIQUID throw a little more rum on it until you have a suitable amount of liquid. This amount of colorant can last a while, so whatever's left, keep it aside for a future colouring.