Why not? If you like the quilt the way it is, go for it. It is your quilt after all. I altered the quilt showing in my avatar. The pattern had some small pieced blocks which I did sew. When I layed out all of the blocks before assembling the quilt I thought these blocks were "too busy" so I changed them to my liking. I sent a picture to the pattern designer pointing out my changes and she liked it as well, so much that she was going to post it on her facebook page.
I hope you post pictures when you finish your quilt.