Welcome to our forums!!
I'm glad to see you don't give us a tough question for your first post!

Without having your beads in my hands or spread out on my table I have a terrible time helping design.
For a "Native American" look I can suggest looking at a site with a lot of good turquoise in Santo Domingo Pueblo designs at
http://www.skystonetrading.com/pueblo-jewelry-4/ Most of these are heishi based. Another page
http://www.skystonetrading.com/all-necklaces-20/ has a few more nuggety designs.
A focal pendant might help but what sort would you like?
I've used small silver or silver colored metal heishi as spacers. Dee restrung one of my necklaces with small vulcanite (African plastic black heishi wafers) as spacers, just to keep the beads apart at the center of the necklace.
I'd not
pick Crazy Horse stone to use with turquoise but I''ve seen some Oregon picture jasper in similar colors but bolder patterns that worked well with turquoise. So it might work well either as a center stone or accents.
I don't think I've been a lot of help for you tonight. Maybe someone can jump in who can picture your beads better than I? If you have a LBS (local bead store) you might find some advice from stringers there when they can handle your turquoise.