Chris & Marie's Plant Farm in suburban Melbourne. The owner, Chris, has a high-pitched and distinctive voice, which stands out from professional style advertising. Their kitschy catchphrase "Hello Hello" plays to their strengths as small business owners; it's authentic, and draws people in.

The Blind Factory one - possibly a bit annoying but very catchy and I'm sure effective. Many have done well with creating sing along and memorable jingles.

I don’t think National Tiles qualify as a small business, but their Frank Walker voice and accent stays in your head. There are a few lessons small businesses can learn from their radio ad.
 
Their message is simple, and important information are repeated, which is like most good radio ads. But the one thing that stood out is the actor’s accent and way of speaking. It is so different from what you hear on other ads that it sticks out and pulls you out of your auto-pilot driving stupor. They did a great job with picking the voiceover guy.
 
At first, I found the ad annoying but after listening to it a few times, it sunk in. I was in the midst of renovating my house and ended up browsing at National Tiles just because of the ad. I didn’t buy anything from them as I found cheaper options, but their radio ad managed to get me through their door.