are there themes we can import at the click of a button by chance, I’m surprised there isn’t a list of themes already built in we can select from, can you help?

we are looking to import many themes to see which ones would be most appropriate, colors, fonts, backgrounds etc

Looking for something closer to stock trading software themes with dark/black backgrounds, colors that pop, and more efficient use of space like these:

Willing to pay someone $250 to have this created?