Garam masala, chili powder, italian herb blend, a sweet curry powder, and pie spice (cinnamon, nutmeg, etc). I could do a few cuisines with those I think.
By blends, I assume you mean ready-made mixes of more than one ingredient.
If I could add a 6th, it'd be a half/half mix of cumin and coriander. That isn't something that is commercially available as a "blend" so probably would not fall under your criteria.
And "welcome back" Amaranth- haven't seen you post in a while.