Hello! This is my first sharing here, I don't use to do it but I start to love this program.
I created for this work some base with textures, and effects, on the top I've created some digital painting for the cracks (hope is the right word :) ) As you can see the difference from locked and unlocked levels are the luminosity of the numbers and base, in the unlocked levels we have a glow inside and outside and in the locked we have the deep engraving with shadows. You can find my UI portfolio on my FLICKR UI Album Enjoy