Can I have Blue and green for main colors, but orange and yellow flowers?

This years fashion trends actually accomadate your request to an extent. No yellow! Otherwise, with your other colors you will look like Krusty the Clown was your wedding planner. The 2008-2009 trends are as follows, with Orange your colors can include, Tangerine, Coral, Red, soft Violet, Sky Blue or Fuchsia, and beige tones.

Congratulations (and keep your heads down!),
You are in my prayers,

Susu

Blue and yellow go great together! I wouldnt use all four colors, If you want orange than go with it but leave out the yellow, but I think yellow and blue look the best together. Whatever you do I hope it turns out well.

You can absolutely do this. Perhaps you incorporate the blue and/or green into the ribbon tie on your bouquet. Or incorporate blue and/or green into the aisle flowers. Also, talk to your florist they will help you come up with great ideas to incorporate all the colors so that it's beautiful.

Blue and yellow are ok with maybe more of a touch of peach but mint green might work, but to many color could look bad

I would do the main wedding colors in a soft blue and sage green with creamy white, and then carry of bouquet of creamy white plus soft oranges---tangerine, apricot, etc. Lovely! Best wishes...

You could, but no offense I think it would look trashy.

It would look fine if everything is the same tone.. if you are having pastel colors, than you will need pastel flowers, if you are doing bright yellow and orange, than the blue and green need to be bright also. Good luck to you!