I make them work for me bu using them in the following ways:
1. I use them on my lower lash line area - which is much lighter than my lid most colors tend to show up well here. (P.S. This tip won't work if you have dark circles)
2. Use a white colored primer/base. Sometimes liners don't show up coz they have tones that match our skin too closely - try using them on top of a white base - that should help the colors pop.
3. Mix it up! Layer the light colored liner over a darker one for an interesting look. I have a liner in green - that is honestly too light to show up. What I do is apply it over a dark grey creamy eyeliner - the green while not very visible - makes the eyeliner appear a tad smokey green, plus the green shimmer really stands out against the grey. Ta Da - I have new color!
So what are your tricks to make those dud eyeliner purchases work for you?