I see the direction of the quilt and understand your feelings about it. I agree with the suggestion of unsewing. I would take three rows off one side and add them to the bottom. You will need to completely take them apart down to the blocks to be able to change the direction of the birds. After you are happy with that, you can then add as many borders as you want. I would even add another fabric with hummingbirds all the way around. This fabric can be of the same family of colors. There are tons of hummingbirds out there. Another thought and this is just me, I would add a small black border around it, add more rows with the different hummingbirds, and add another row of black this time a little wider, and so on, until my last row was black. I find that adding back is elegant (since the background of the hummingbirds is black) and makes it look like you planned it that way.
When a customer ask me for a lap quilt I always ask how many laps.
The general rule I tend to see is that single people ask for a lap quilt for one lap, therefore longer than wide, Newly weds and young couples ask for a large lap quilt to cover both laps, therefore square. Older couples ask for two lap quits, but looking exactly the same, therefore they are still toghether and connected, but each under their own space.
Maria