Schris-
MI zone 5? Me too.
I can see a rose of sharon bush between the bay window and the little one to the left. Under the bay, some miniature fragrant bushes-Miss Kim lilacs maybe- would only grow about 4' high and could be pruned to stay under the window. If fragrance isn't important, another idea would be barberry bushes. They would add color during our long winters and can be pruned into behaving under the window. The white stones would be a nice contrast to the red of the barberry. On the garage side of the porch maybe something evergreen-dwarf alberta spruce or golden tipped boxwood?
Be sure to allow for spread of each and then you still have the ability to plant annuals for a splash of color in front of the bushes each year.
Just a couple of ideas-
MM