apriljoeysmom - I suggest you have a look at this thread. You may find there is no space for companions after a while. If your climate is not one in which the bluebells will go mad, Doronicums would look jolly with them.

Here is a link that might be useful: Spanish bluebells

They are so vigorous in my garden that they even kill shrubs. Let alone other bulbs and perennials. I've been trying to eradicate them for over a decade and I didn't plant them in the first place. I removed lawn and created beds and up they came.....

We moved into my parent's-in-laws house 26 years ago when we bought their farm. I have much more extensive gardens than my mother-in-law had but there are a few things here that she grew that I haven't been able to get rid of-a few peonies, jerusalem artichoke and spanish blue bells. The bluebells or wood hyacynths she called them- are only in one small garden alongside my house that never gets enough moisture and even though I try every year to pull them out after they bloom they still keep multiplying. I have dug out hundreds when we fixed the house foundation and that only inspired them to do better. When the blooms are done the foliage falls flat on everything else and then gets slimy. They can't be like other bulbs because I never give the foliage time to die off but they still grow. They whole works gets yanked as soon as the blooms are done.
I would never plant them in a flower bed-maybe in the woods or a wide open space that they can multiply in. Very pretty but too invasive for me.

I have a few under a spruce tree---it is dry shade and they are not trying to take over---but they do look nice. Mine are with sweet woodruff (also will take over elsewhere but tamer in the dry shade) and some grape hyacinths -- and crocuses and squills, though they do not bloom at the same time.