Looking a tutorial to make a custom part!

[Philippe Hurbain]

Guys i want to make a very simple custom part. its a rectangle with a png snapped on front with transparent background. its possible to make this? (EASY WAY)

 something like this. its to add into a model in a building instruction. that will be overlapped to a model

Probably the simplest is to use Roland's sticker generator http://www.melkert.net/test/stickerGen.html