Thanks for all the bug reports. Unfortunately, the particles are the one thing that can't be changed because those colors are used for many other things that still require the normal color. I'll look into everything else when I have the time though.Found a few bugs.
When hovering over a rupee all it says for the tool tip is "Can be placed" when coins have an "Ammo" tooltip and have a damage amount. (See wiki page for coins.)
Also Coin Stashes you can find generated in your world don't have the right texture, they have the texture of the default coins.
Placed Coins when mined (Say they're green) when mined they'll have the Copper Coin particles not green.
Money Hair Dye doesn't work correctly and still uses the default coin colors (Copper, Silver, Gold, Light Silver/Platinum)