Your quilt is beautiful! Borders are a choice...it is up to you.
As for getting scrap pieces...I would check out the local Goodwill/Salvation Army/Garage Sales/Your own Closet....scraps are fabulous and accumulate very quickly. If you prefer to buy new fabrics, fat quarters and charm packs are a great way to begin.
I hope that you have a great time on your new journey into scrap quilts. The possabilities are endless.