I like this place for variety of sizes and colors, and low prices even with small order sizes. Like 30 small bags for $3-4 (prices from several years ago)
Note that you can buy them big enough to hold a bottle of wine - or most of a huge flower spike on a giant Delphinium.
Best Organza: Patti1957 order sizes around 30 or 10.
http://www.yourorganzabag.com/...
3"x 4" Flat Organza Bags 30 bags / $2.70 (OLD prices!)
4"x 6" Flat Organza Bags 30 bags / $3.90
6-1/2"x 15" Organza Wine Bags 10 bags / $3.90
I think that, since the air can pass through, they would not overheat.
Dark green would probably be most inconspicuous.