Irssi easily can be themed by adding .theme files and using either while inside a session with /load [theme.py] (use your tab completion), or have your theme load automatically with /SET theme [theme.py]. Look for a suitable theme here. Of course you can create your very own theme from scratch.
Weechat does allow for themes, but still in alpha stage, and there are limited available, but fwiw, you can find them here. You can also make your way through the ~/.weechat/weechat.conf file and make some changes piecemeal like. Caution though, weechat will re-write your new config, so I'd suggest, having weechat open, make some mods in the conf file, then /reload weechat. When you're happy, /save. Some areas to look for in weechat.conf, first and foremost, at least for me ...
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status.hidden
title.hidden
Lastly, for both clients, there are plenty of scripts available for adding functionality, for instance, notifications. Irssi has a scripts section in their website. You can also bring in a bunch with
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apt-get install irssi-scripts
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ln -s ~/.irssi/scripts/<script> ~/.irssi/autoload/
Anyway, so I'll leave it there.
Enjoy!
Edit: IRC client in scrot is weechat.
Edit2: IRC client discrimination was not intentional.