Hello and welcome! I like it just the way that it is. If you have enough of the background color of what the birds are on (green) then see how you like it as an additional border once you put it all together. Adding borders is always a good way to enlarge a quilt that you otherwise don't have enough fabric to make bigger. Or you could add more borders of some of the other fabric in the quilt. And no, the purple looks good. It adds some color other than the earth tones. Very nice job. Each quilt you make it will get easier to cut into that fabric. There are no mistakes in quilting. Just a chance to learn and expand our horizons. Cheryl