Some drop in HM ops or i have gotten a magenta crystal schematic to drop in the 4 man heroic in Black hole.
No crystal schematics drop in Ops.
The Orange +41 schematics drop from the Primal Destroyer (Belsavis world boss) very rarely, along with the mid-tier Magenta schematics. See here
for where to get the other Magenta schematics.
Other than the ones from vendors that you've noted, +31 and +41 Expertise schematics (Purple, Cyan, and Yellow so far confirmed) drop extremely
rarely from the Grade 6 PvP mats box.