I find advertisements from magazines, like "i weekly". If its
nice, I will take the advertisements and do some measurements to it
to fit my buses. If its ok, then I use printer to scan and print
out the adverts on A4 paper.
Step 1: Place the adverts properly the way u want on your
bus.
Step 2: Press the outline of the bus, including the windows (not so
hard, so long as its visible to u).
Step 3: Use pen-knife (for art use) to cut the outline
properly w/ the help of long ruler.
Step 4: Use normal glue (can be easily taken out) to glue the
adverts onto bus body.
Step 5: Cut out the outline of the picture or information u
want to paste onto the windows.
Step 6: Paste it onto the windows following Step 4.
Bro, use double sided tape, easier to take out...
Alternative method use digicam take pix, tfr pix to MSword,
crop,resize and then print