Welcome, @LeoMoon- great question!
I second this! 
White candles are very universal- if you are ever lacking a certain color candle, white can take its place 
Additionally, dressing the candle and/or carving sigils or words on the side can further help to give direction and enhance your candle magick 
When it comes to money magick, another alternative to green is gold- a color traditionally associated with wealth, luxury, and finances 
Money spells are particularly potent when cast on either a Thursday or a Sunday. You can also get a boost by including money-attracting herbs such as Basil or Ginkgo 
Wishing you all the best with your money spell- may you be blessed with an abundance of fresh new funds 
Blessed be!