Text boxes with custom background colours in Docs

I use blank docs as a notes space. Something I think is missing is a sticky note-like feature.
Boxes where the background can be a user chosen colour, and text able to be added. There is already the notice box, however the colour can only be changed to one of four colours.
An addition like this would help people such as myself who find it easier and less stressful to manage projects visually and with colours.