I remember one time I installed a lot of themes for my session and I broke something and the themes changed my icon files forever and I had to reinstall Ubuntu!!
Should I just stick to changing my wallpaper and other small tweaks? I don’t really like using vanilla Ubuntu anymore, it doesn’t feel like me. Thank you very much!!
Don’t get scared. Even when you f*ck up the most you can just wipe out the theme related files from your home folder and start from scratch. GNOME is probably the least customizable, among DEs KDE, XFCE, LXDE, MATE, they all work well, or you could also try tiling wms or classic wms like fvwm…