My next site is Scribbler Too. I find that if I have something in mind when I go to these sites then I can often produce an interest drawing. Yes, start scribbling to practise (and something might and often happens) but if you find that it is just a mess try and think of a structured doodle.
I decided with my drawing that I wanted to produce a rectangular box to save as a pattern and once I started I did pretty much improvise as I went along. I set the background to black and the foreground to white with a bit of colour here and there.
This is the result:
I then created a pattern from it (look here for how to do this) and this is the result:
I blended a colour layer with it:
But when I added a pattern tile I photographed at a church, I was really chuffed: