These are common on motorcoaches. Pre-designed liveries customers only need to specify the colors of.
However, I recently discovered that transit buses have these too. Lethbridge Transit's Novas use one of volvo's pre-designed liveries with their own colors. Similarly, Vancouver Regional Transit System's, CMBC's, and Academy Bus Lines' D60LFs all use the same livery design with their respective colors. Same thing with Halifax and Western Michigan University D40LFs (Not really related to the main topic but these pre-designed liveries are often co-opted by agencies and used on other buses - the Nova-designed livery is used on Lethbridge's Xcelsiors while what I assume is a NFI-designed livery is found on Academy's Novas - similarly, TransLink decided to adopt that D60LF livery and made their own version of it with a few changes). With that being said, are there any other transit buses that have pre-designed liveries?