The voting banner is using SimpleBanner for wordpress. To add the background slash, I used this css:
background-image: url(“/img/slash.png”);
background-repeat: no-repeat;
background-position: right;
with this (partly transparent) image:
and with these colors:
Blue – #3DD2D7
Red – #F15D3A
Green – #6EBE44
Yellow – #EDE511
Or if you’d like to print and hang a flyer: