This is a bash script that changes the background color of the terminal every time a new terminal opens. Add the code below to the very end of your .bashrc file.
q="#\033]11;"
W=("#800080" "#800000" "#A05000")
e="\007"
echo -ne $q${w[RANDOM%3]}$e
Credit goes to reddit user Code33301. https://reddit.com/user/code33301