Thank you for taking the time Amanda!
The Mexican red knee is especially Gorgeous! Does it like to make webs?
I think I remember seeing a black and purple tarantula, but I can't find anything like it when I do a search. Have you ever heard of such a thing?
Mexican red knees can web, but they're not known to be frequent webbers.
There's a few arboreal tarantulas that have purple hues I can think of, most nothing as vibrant as many of the blue colored species out there. Purple tree spiders are one. And ornamental tarantulas are beautiful (but they're not solid black or really purple). Singapore blue, French Guayanan blue fang, and cobalt blue tarantulas are known for their striking blue colors.
For some reason, I never saved any good pics of my blue spiders