Here is one type of trellis pattern but it might be too much for your flower blocks:
http://www.hoffmanfabrics.com/EDocs/...%20pattern.pdf
Or perhaps:
http://quiltbug.com/images/patterns/in-my-garden.jpg
Or a simpler design:
http://www.quilterswarehouse.com/p-3...n-trellis.aspx
Good luck with finding that "perfect pattern" for these lovely blocks.