To make my tree the "knittiest", I look out for ornament patterns in knitting books all throughout the year. I have found that the best source for these patterns are in books and leaflets by Jean Greenhowe and Alan Dart. This year (so far) I have 25 additional trims and I had a really hard time finding space for all the ornaments on the tree! Perhaps I should have two trees next year.........
Step 1: What to do with a great ornament pattern
Step 2: Keep searching for patterns
Here's her website - she has a new Holiday pattern this year too!