I've been using evernote for 5 years and then comes **another product from competitor** and introduces note coloring and note pinning and it's suddenly so intuitive to use!
Here are the suggestions:
background color of the note snippets (only snippets) so they can be easily distinguished by color in the list of notes inside the notebook. The background of the note itself doesn't change so it doesn't become hard to read. As one exception, a title space of the note can have the same color as the note snippet to connect style of the note to the snippet.
pin notes to the top of the notebook - this is such a no brainer! There are notes which just must be on top all the time, period, while other notes must follow normal sorting pattern.
Evernote is much more powerful than alternatives but its interface is still a pain.