I think the emerald green plus scales would look awesome on a Handyman.
I'm going to vote for bright pink or light blue. Both highly visible colours that will show up against almost any background you are likely to come across.But it's your knife, so just get the colour/s you prefer....
Stayglow. Nylon, so unbreakable. Glow-in-the-dark. And unlike that weird pearl white color most glow in the dark scales are, Stayglows are bright yellow. The second choice would be ruby transparent. I'm just not a big fan of aftermarket scales. Many cost more than the prices of most common SAK models; new or used. I'm replacing scales on a SwissChamp (broke) and Outdoorsman (they're falling off) as I speak. Both cost me around $30 each, and that's the same cost as the cheapest aftermarket scales I can find.
As I've said many times on other threads, "if it ain't red it's not a SAK" (excepting silver Alox). ( your knife, your choice)