I like using the Google Drawing and Presentation Slides image options tool. This tool allows the user to change the color of the clipart from a wide variety of choices. It also lets the user adjust the brightness, contrast, and transparency.
I especially like the transparency feature. The transparency feature allows me to place a textured clipart layer behind a solid colored shape. This creates an interesting effect. Here is a shape with a textured underlay.
NOTE: The above shape was made from these two shapes:
- The underlay shape
- Top layer shape
- To use a solid shape you created in Google Drawing download the image as a .png and then re-upload it as an inserted image. This will allow you manipulate the solid colored shape with the image option tool.