A good NPK value for an organic flowering nute is 1-7-0 to 2-8-6. You want a little bit of N, but not much.
Well you have a few organic options.
Option 1:
You could make a "tea". OhSoGreen's thread is fantastic!
Here's a link:
Making Tea - is EZ.... & Cheap !
And here's a simple flowering recipe:
Two gallons of unchlorinated water & add :
(2-4) Level tablespoons of High P Bat Guano
(1) Level cup of Worm Castings
(1/2) ounce of UNSULPHERED molasses (ie Grandma's Brand)
(1) ounce of SPT (Super plant tonic)
eBay Seller: blue mtn organics: Home Garden items on eBay.com
*You don't have to add SPT if you want. No big deal.
*You should be able to get guano and worm castings at hydro shop or nursery. Follow instructions on OhSoGreen's thread on how to make the tea, quite easy.
Option 2:
Buy an organic nutrient like BioBizz, BMO (ebay only), AgeOld, etc. Be warned Fox Farm Bloom is not 100% organic.
Good luck, and let us know how it turns out.