You asked for opinions so I'll give mine. Sorry but these fabrics already look a hodge-podge to me, too many similar florals and mostly mid colour range. They remind me of the OBW blocks. Perhaps you can select a few that you really like, and find some plainer fabrics in darker and white/off white colours.
Here's a link to Bonnie Hunters' last Mystery Qlt, maybe looking at others final results will give you a clearer idea of how light and dark look together. Not everyone stayed with Bonnies' chosen colours, but they look fabulous.
http://quiltville.blogspot.com.au/20...-part-6-7.html
scroll right down the page to see many versions.
Good luck