We have a straight flower bed covered in brown hardwood mulch in front of our house. It has one goldflame spirea bush, a decorative rock, another goldflame spirea bush, and then a crimson pygmy barberry bush, another decorative rock, two Korean boxwoods next to each other, another decorative rock, a small hot shot azalea bush, and froebelii spirea, another rock, another Korean boxwood, and a sweetspire henry's garnet. We would like to make the bed a little more exciting. Any ideas would be helpful. Thank you so much!