Another option as well is to combine elements from several or a few patterns into one pattern to make a unique pattern.
I agree. I try to do that. Plus go look at patterns you like and make some changes or additions to it. Voila, a new pattern!
A good habit to try to get into when you're looking at things, whether it be an ornament or a picture (or whatever) is to ask yourself 'what can I do with this in glass'. Go look at art stamps, sometimes you can get some fun ideas from them too.
I do get bored because I do a lot of repetitive stuff for the shows but I remind myself how much I like getting the money for all these things I do! I find my happy place while I'm doing all that repetitive stuff and it's not so bad.