To help ensure there is no moisture in your filament I would recommend a filament dryer. The purpose of this is to remove moisture from the filament before printing, which can help ensure the quality and reliability of the print.
This is a list of multi coloured filament that I would recommend
This filament will change colour depending on the temperature. Or some of these filaments are UV reactive meaning that it changes colour when it is in the sun.
This filament gives a stone effect when printed. Perfect for printing vases and 3D models that you would like to look like stone rather than plastic.
These are a few solid colour filaments that I would recommend if you're looking to print something all one colour.
This is my all time favourite glow in the dark filament!