Meredith, Hi!!
Now you sound like me. Seems I have a holding garden tucked into a corner of every flower bed I have, and all for the same reasons as you have them. I see something I cannot live without, bring it home and then wonder where on earth I will plant it! I think it must be typical of gardeners.
Sometimes the odd clusters of plants work well together but more times than not, we rework them and transplant them and end up doing almost the same thing somewhere else. It's just a good thing we can laugh about it and move on. And it's a good thing plants can tolerate our erratic behavior!