There is a lot of ideas of candle holders made out of wood, rustic, fresh, reclaimed, all kinds of wood. Interesting is the effect that light from fire brings out, wood, especially one that is weathered-looks amazing lit up with warm candle light. Take a look at these samples, some are very easy to make, basic tools and a piece old looking timber can make your bedroom look really romantic.
Good rule of thumb is not using finish like teak oil-flammable as well as keeping the candle itself in some kind of container, like a glass before placing it inside of wood.
But overall, this combination looks really cool, especially when wood is finished in some reddish colours, like red mahogany or even dark walnut, fire light will play around these colours like a violin;)