They are not items given to you when bought. When you open the recolor menu, you click the color wheel and pick the color you want to unlock. Once you've chosen one, it selects that color for the slot you've clicked. Here's how mine looks
You'll see that it says I have two dyes left. They won't be added to your bank or inventory.
If you see me out of the tower, don't ask me to send you to the rune essence. I'm on my break.
Work in moderation.
Ohh, I see the problem. The outfit you've chosen doesn't get the full range of colors because the colors change depending on your health. When you take more and more damage, they change. You should have also gotten an inactive variant of vitality when you bought it. That one CAN be recolored.
I don't actually have Vitality myself but I previewed the inactive variant with my custom dark blue just to prove the point.
See? You should've gotten two sets when you bought it.
If you see me out of the tower, don't ask me to send you to the rune essence. I'm on my break.
Work in moderation.