I wanna make a magic item of rose colored glasses. Glasses that when looked through tint the world pink and make it beautiful. I would prefer to have them be, at most, uncommon. Maybe it's both a positive and negative effect.                      Any ideas for the actual effect? I can only think of it in general terms.

How about something like this?

Rose Colored Glasses

Uncommon, (requires attunement by a sighted creature with eyes)

While wearing these rosy lenses, you can see in dim light within 30 feet as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of pink. If you already have Darkvision, wearing these glasses increases its range by 30 feet, and changes that vision from shades of gray to shades of pink. Spells and anything else that would detect or reveal your alignment treat it as good while you are wearing these glasses. In addition, you have advantage on Ability checks against Intimidation attempts by creatures you can see, and advantage on saves against being Frightened by creatures or things you can see.

Curse. These glasses are cursed and becoming attuned to them extends the curse to you. As long as you remain cursed, you are unwilling to part with these glasses, keeping them on at all times. While attuned to these glasses, you automatically believe the best in all people, and every situation. You have disadvantage on Initiative rolls, Insight checks against creatures you can see, and Investigation, Perception, and Survival checks relying on sight made to detect traps or other dangers. In addition, creatures you can see have advantage on Charisma (Deception) and (Persuasion) checks against you.

Well Palence, what do you think?

Actually that kinda works perfectly. Thank you.

Positive effect: advantage on saving throws against being Frightened.

Negative effect: Disadvantage on Insight checks.

This seems like a really neat idea, I like the 30 Ft of Pink darkvision.