I've added a couple of themes.  Current themes are

- ElkArte default
- Silence (dark...really dark)
- Square Era

You can change your theme in your control panel.  In the top right corner of every page is a button with your account name on it.  Hover/click that and choose "Look and Layout" to go to the right page.

I'm trying the dark theme.  Though I do like the default one.

um, no, Silence is too dark! Back to default, for me

You might like the Storm Cloud theme.  It's not as bright as some of the others.

thx, storm cloud is nice, have switched to it