Create Custom Car Stickers?

Hey,

I’m looking for a site that will allow me to create a custom car sticker.

Most of the ones I’m finding are for rectangle bumper stickers. They have no transparency and don’t allow pictures. Only text.

You’re very limited to what you can do with the custom templates they provide you.

I basically want to upload an image of my own (It’s going to be one of those "I <3 Thing" things).

Any help appreciated.