I'm with Corey- in that my trees are themed (yes I said treeS as in plural!!!)
CHRISTMAS is MY Favorite!! I'd have trees in every room if my family wouldn't boycott!
The only time I buy ornaments is if they fit my themes- Our main tree theme is snowflakes, glittery & blues/pinks/purples with LOTS of shiny pretty things!
My office tree is a white tinsel tree with rainbow them and it's a pencil thin tall tree- so I don't have much room for anymore ornaments- occasionally I'll be on the look out for a particular color- usually yellow/orange as not a lot of ornaments are that color- but it's mostly done with what I've collected in the past. Our front porch tree is very simple- no ornaments- but I've thought about doing a different theme out there- maybe rustic/wood type.