What are some good colors/ideas for something to wear with gray tights?

Um, grey is a neutral so it should go with basically everything. It depends on what kind of look you want to achieve!
I also noticed that often when you try to do some mix-n-match and nothing seems to look good it’s just because you’re experimenting and you come up with outfits you’re not used to seeing yourself into. At least, this is what happens to me :)

I personally would go for a print/pattern dress/shirt/skirt that has some grey in it, or either match the grey tights with navy blue, which is a combo that I personally adore.

For color matching inspiration:
Wendy’s amazing guides on CoedUgly: 1 ; 2 ; 3
Wear Palettes

:o I just uploaded an outfit with grey tights. :)
I’m finding they go with quite a lot so I’m surprised ‘nothing seems to look good’. Maybe try them with a pattern such as a bold floral? Or else I think block colours such as (moderately deep) purple and red should go. Perhaps avoid colours that are similarly light.

Florrie xx