door

for the door,

Create a new layer in Photoshop and fill it with a light brownish, slightly orange color. Try different colours depending on the type of wood grain you want to create.
Goto Filter->Noise->Add Noise and add some noise with the following settings.

Goto Next goto Filter->Blur->MotionBlur and use these settings 
Motion Blur Settings(opens in popup) 

Your image should look something like this. Next take the following steps
Duplicate the Layer
Goto Image->Adjustments->Desaturate
Set the layer's blending mode to soft light and give it a low opacity 

Then select the duplicated layer and goto Filter->Artistic->Poster Edges. Use the default settings.

Now the wood is starting to look somewhat realistic, but its not quite a there yet. The problem is that the photoshoped wood is too perfect (more noticable with a larger sized picture). Real wood has knots, wane and other irregularities in it.

Goto Filter->Liquify

The best way I have found to create the knots with the liquify filter is to take the following steps
Select the spot to create the knot
Use the nudger tool to create push out the wood texture on both sides of the spot you selected
Then use the spiral tool in a slight up down motion to create a realistic knot.

reference

http://www.tutorio.com/tutorial/photoshop-wood-texture