What don't you like about allium? I don't make drawings either. I like to pick one plant and choose others that will look good with it. Then I pick one of those plants and make choices of what to surround it with.
First I pick plants with a nice variety of sizes and textures. I've found I'll enjoy a garden more if I find the plants to be attractive. If I make a mistake with color then I van use one to fill a vase for my home.
In this picture I think the removal of the hosta with its larger leaf would take a lot away from the whole composition of the bed. I also love the contrast of the sweet potato vine against the sedum.
