AH... those are cool. Have you looked into sites like Ravely
I have a hard time coming up with prices on stuff like this because they take a good amount of time. We have a local Art / Coffee shop that sells a lot of stuff like this. I've seen stuff from $17.99 to $25... or more depending on design and intricacy. Do you have local art stores / coffee shops like that?
The other idea is... once you have patterns, you can sell your patterns as well. Some people fare better in the pattern category.
The other thing to keep in mind these days - selling anything under license can come with legal issues. Sticking with original designs is probably best - if you are looking to sell.