I can't say I was in the market to find colorful shoelaces but after trying out the pink ones in my birchbox (very much a style risk) and got some compliments on them I decided to keep it going.
The orange and blue ones I've used with my grey dress shoes - both have looked pretty good. Haven't used the green ones yet.
For October I switched the orange ones out for my black wingtips for a bit of a more fun look.
If you're looking for a subtle way to be unique, especially in a corporate environment where khakis and button downs/polos are the norm, these will do the trick.