Why not do the exact opposite what the presentation design establishment is trying to teach you - on purpose?
Dave McClure is an investor in startups that does exactly that. Random colors, bullet points galore, "love that clip art", arbitrarily placed images, and some pretty rough language. Kicking the presentation etiquette. Building businesses is all about getting your hands dirty, passion & energy, and ignoring slick packaging. It's the substance that matters.
Here is a recent presentation (some strong language):
how to pitch to a VC (strong language)