You can apply various pattern and even image fills to vector objects in PowerPoint. First with your mouse select the shape you want to fill then select fill colour > fill effects , you can then select pattern or texture . For an image fill in the same menu select picture > select a picture and then navigate to the desired picture on your computer. To created effects on just the line select line color > patterned line and choose a pattern and colour combination, or alternatively select line style > more lines and choose a line style.
With these techniques you can created many varied and interesting effects.