I create my designs by hand drawing, and i love most is the celtic art, i got inspired with this piece from a book i saw and i start drawing it on a piece of paper, then i scan them and i start to work with them on adobe illustrator, cleaning, make them better and give them the final shape.
This is the Celtic tree design:
This is in the public domain, feel free to download it and do whatever you want with it, this is a copyright free clipart available to be used in any publication you want.
Available in EPS, AI, CDR, my designs are free and in the public domain
Download link : http://upload-il.net/en/D0C6A3d6C4D/57