got the info working locally, let's see if I can upload them
I know the bright wisps don't actually look very bright here, but it wasn't a good screenshot I'm afraid. they look brighter in person!
Tiers 1-3 wisps have the same colour for both sparkles and the "shell" of the wisp, tiers 4-6 have different colours. I kept to three basic colours for ease of play, and there's only one area (wisp island) as far as I know where there are different types together..
extract the files in the zip to the usual location.. (resources_override)
http://www.lotro-crafting.com/HZ/colouredwisps.rar
oh and I nearly forgot. It includes the tint files to make the essence, orbs, and construction items for T1-T3 a different colour too