It's hard to find free continuous-line quilting patterns on the internet, but this site has collected links to a few (look through the listings to see the possibilities).

http://www.needlepointers.com/ShowArticles.aspx?NavID=1379

Also, some libraries have books of patterns - perhaps yours is one.
Here are some other approaches, too.
A very traditional and also very simple style of quilting for this quilt pattern is to sew a continuous diagonal line through all squares of the same color, forming concentric diamonds of stitching on the surface. Here's a link to a picture where you can see the quilting clearly.

http://www.picturetrail.com/sfx/album/view/1473927

The same general idea but with a scalloped or undulating line of stitching instead of a straight one looks very nice, too.
If you're able to do free-motion quilting, many people meander-quilt this design, or lines of cursive Ls and Es look very pretty. A continuous-line leaf pattern like the one in this picture (scroll down to the 'challah cover') would be lovely, too.

http://www.forevergreenquilts.com/free-quilt-patterns.html

Hope one of these works for you. Congratulations on finishing your quilt top!