Slider appearance

I am trying to use both rotary sliders and linear sliders. The first thing I would like to do is add markings. I see no option for tick marks on the sliders.

For the rotary, just periodic marks every 30 degrees or so.
For the linear sliders, a logarithmic dB scale would be nice.

How do I do this?

Also, I would like the rotary knob and the thumb of the slider to look more like real knobs.
How do I do that?

You can either use a filmstrip of image data, or draw your own in software. Just overload the appropriate bits of the LookAndFeel class in your own derived class and then set the application to use the custom version. You can get hints on how to switch between different LookAndFeel s from the JUCE demo code.