Here’s a quickie tutorial showing how to make a pretty picture from your SketchUp model. This is quite simple and there is no end to the variations you can create.
This is what we’re going for. Please note, I didn't do any post SU prcessing of this image. Normally I would do some cropping and possibly some contrast correction. this tutorial isn't about that part of the image creation though so I'm showing you the output straight from SU.
First we need to create the image for the watermark. I’m just doing some simple lines but you could do anything. In this case I drew a line on the green axis. The length isn’t critical here. I used 60”. Select the line and use Ctrl+Move to make copies at some interval. I used 2”. After entering the distance, I hit *60 Enter to make 60 copies. The number isn’t critical but you want to end up with an array that is wider than the length of the lines by at least a factor of 1/3. You want to be able to fill the drawing window with the lines.
Choose the top view and make sure the lines fill the drawing window.
Open the Styles dialog and choose a style for the lines. Here I am about to select the Sketchy Crayon style. You can play with different styles to see what you like.
Selecting a style.
I edited the line style a little under the Edit tab. In this case I turned off Depth cue and Extensions.
Editing the line style.
After I get the lines looking the way I want, I simply export a JPG file of them. It you want to use it, you could save this image and start from the next part of the tutorial.