color & line - overcoming a creative block

I have been struggling with a design project. I just can't get over the creative block. So, I spent the evening (til 1 am actually) looking through magazines, making color sheets and brainstorming with a brush. As always, this helped.

Why is it so difficult to make time for this? I guess I feel guilty. Is this work? I need to remind myself that from this, work is easier.

Color Study Series

The above came from hours of doing this...

Then came the paintbrush. Playing with brush stokes and line weight.

What do you do to overcome creative blocks?