Photoshop Tutorial: Crakced sig and using no brushes
Ok I was playing with photoshop and found this
[b:h3z72typ][u:h3z72typ]Step 1:[/u:h3z72typ][/b:h3z72typ]
Open your canvas and fill it with the colour of your choice I chose white #FFFFFF.
[u:h3z72typ][b:h3z72typ]Step 2:[/b:h3z72typ][/u:h3z72typ]
Pick two colours, so step one is not that needed but that's how I started off so you may want to try it. The colours I used are:
#A10707 And #FFFFFF So a kind of redish colour and white.
[color=red:h3z72typ]Note: It's best to choose one dark colour and one bright colour so they show up.[/color:h3z72typ]
[u:h3z72typ][b:h3z72typ]Step 3:[/b:h3z72typ][/u:h3z72typ]
Filter --> Render --> Clouds
[u:h3z72typ]
[b:h3z72typ]Step 4:[/b:h3z72typ][/u:h3z72typ]
Filter --> Texture --> Craquelure.
That's you done.

Feel free to ad more effects to your liking.
Here's my final result: