Since rhododendrons are acid loving plants with shallow roots, companion plants are usually acid tolerant plants with roots that won't compete with the rhododendrons. Some suggestions are: Adiantum , Anemone, Arisaema, Asplenium, Astilbe, Cyclamen, Euphorbia, Helleborus, Podophyllum, Polygonatum, and Pulmonaria.

Hi rhodyman, Thank you for your suggestions. This is really going to help me a great deal. Since I have no idea what most of these plants are or what they look like, It'll be fun to Google them. Thanks again for helping me and providing me with a good selection to choose from.

Perhaps columbine as well?
{{gwi:384649}}
(I forget what the white thing is called)

Hi Jon,
Thanks for the idea. Wow, I love the color of your rhody. What kind is it.

It looks like a deciduous azalea. Some possibilities include Golden Flare or Klondike. I have grown Klondike and like it very much. There is a similar azalea that is more orange that is Gibraltar. They are very hardy and tolerate moist locations much better than most rhododendrons. I grew them on hillocks in a boggy area where blueberries would grow well.

The white looks like white yarrow.