You may sometimes want to photograph a dimly-lit interior using natural light. This can be done by raising ISO sensitivity. You may think that this would result in "grainy" photos, but in fact much progress has been made in reducing "noise" (randomly-spaced bright pixels and fog) in photos taken at high ISO sensitivities.
You can also produce innovative results by adjusting white balance to emphasize the effect of the dim lighting. Choosing daylight white balance under indoor lighting brings out reds for a warm effect.