Adult Swim had a long history of freaky billboards that were advertised in Atlanta, New York, Boston and Los Angeles.

Picture Summary Description
Red baby
Demon Baby A Demon Baby with Yellow Cat Eyes. Possibly made around 2005-2006.
Happy new year adult swim billboard
Demon Baby (v2) A newer version made in January 2017 for New Years Day
Adult swim tiger billboard
Tiger A tiger in space. Unknown year.
Happy-Holidays-adult-swim-155991 800 600
Happy Holidays A Man and A Woman celebrating Christmas. Unknown year.