I got some higher resolution logo images and such from Ciaran. This allowed me to graphically improve his website a lot. I also found a really good website that gives hundreds of subtle patterns to use as backgrounds. http://subtlepatterns.com. I will probably put these to use in the boxes that appear when you click on one of the balls.
I found that instead of using fixed pixel sizes for things, you can use “vh” and “vw” now, for “viewer height” and “viewer width”. This means that the page title, and all images at the top will get smaller and bigger when the page resizes. The tutorial also told me how to make the pentagonal design have the balls get closer and further from the centre, so it all looks pretty good when I resize it.