Also uses more power, so a bigger battery is used.
We won't be doing color in the forseeable future. I think I would go with a totally different object before doing color.
We are talking about building an IOT keychain that has a lot of sensors and bluetooth and a display and buttons, etc etc. Think like a mixture of open source Tile / Amazon Dash + Arduboy. With a focus on it's ability to be used as a mobile 8 bit music tracker. Create little songs on your keychain when you are bored. Use those as ring tone notifications for different events on your phone via bluetooth.
Wait, am I off topic?