Modus themes are so rad - they look bleak at first, but after a while they grow on you. Then you try some other theme and notice how terrible it is to look at due to lack of contrast. I am convinced now that most theme makers have not the slightest idea what they are doing. Modus and PragmataPro font are two things which spoiled themes and fonts for me.

But, Prot also has other incredible packages - I am a user of denote, his notetaking package. Then there are ef-themes, for those who like themes with more color. There are gems there, but really, one should try modus for a while first.