A few nice Mite images I found:
Mind the mite
Image by MarioQA
A parasitic mite attached to the opisthosoma (abdominal part) of a female Tetragnatha. It appears that mites attach mostly along the softer sutures of spiders carapace, where it separates during molting.
The body of the spider was about one cm long.
Spider lily mites 1
Image by Scot Nelson
Spider mite damage to Spider lily leaf.